分式的化简求值题取值代入无意义怎么办 求40道分式的化简求值题。急！
\u5206\u5f0f\u5316\u7b80\u6c42\u503c\u9898\u53ca\u7b54\u6848\u5206\u5f0f\u7684\u5316\u7b80\u6c42\u503c\u4e3b\u8981\u5206\u4e3a\u4e09\u5927\u7c7b\uff1a
1\u3001\u6240\u7ed9\u5df2\u77e5\u503c\u662f\u975e\u5e38\u7b80\u5355\u7684\u6570\u503c,\u65e0\u987b\u5316\u7b80\u6216\u53d8\u5f62,\u4f46\u6240\u7ed9\u7684\u5206\u5f0f\u5374\u662f\u4e00\u4e2a\u8f83\u590d\u6742\u7684\u5f0f\u5b50.\u5982\uff1a
\u4f8b1\u3001\u5148\u5316\u7b80\u3001\u540e\u6c42\u503c\uff1a ,\u5176\u4e2dx=3.
\u5206\u6790\uff1a\u672c\u9898\u5c5e\u4e8e\u201c\u6240\u7ed9\u5df2\u77e5\u503c\u2018x=3\u2019\u662f\u975e\u5e38\u7b80\u5355\u7684\u6570\u503c,\u65e0\u987b\u5316\u7b80\u6216\u53d8\u5f62,\u4f46\u662f,\u6240\u7ed9\u51fa\u7684\u5206\u5f0f\u2018
\u2019\u5374\u662f\u4e00\u4e2a\u8f83\u590d\u6742\u7684\u5f0f\u5b50\u201d\u7684\u7c7b\u578b,\u6240\u4ee5\u5728\u6c42\u503c\u524d\u53ea\u9700\u8981\u5c06\u201c\u6240\u7ed9\u5206\u5f0f\u8fdb\u884c\u5316\u7b80\u540e,\u518d\u628a\u5df2\u77e5\u503c\u4ee3\u5165\u5316\u7b80\u540e\u7684\u5f0f\u5b50\u4fbf\u53ef\u6c42\u51fa\u539f\u5f0f\u7684\u503c.
\u539f\u5f0f=
\u2234\u5f53\u65f6x=3,\u539f\u5f0f= .
\u70b9\u8bc4\uff1a\u5206\u5f0f\u7684\u4e58\u9664\u6cd5\u8fd0\u7b97\u6216\u5316\u7b80\u5e94\u8be5\u5148\u5c06\u80fd\u5206\u89e3\u56e0\u5f0f\u7684\u5206\u5b50\u3001\u5206\u6bcd\u8fdb\u884c\u56e0\u5f0f\u5206\u89e3,\u7136\u540e\u518d\u8fdb\u884c\u7ea6\u5206,\u8fbe\u5230\u8ba1\u7b97\u6216\u5316\u7b80\u7684\u76ee\u7684.
2\u3001\u6240\u7ed9\u5df2\u77e5\u503c\u662f\u4e00\u4e9b\u6bd4\u8f83\u590d\u6742\u751a\u81f3\u662f\u975e\u5e38\u590d\u6742\u7684\u6570\u503c,\u4f46\u6240\u7ed9\u7684\u5206\u5f0f\u5374\u662f\u4e00\u4e2a\u975e\u5e38\u7b80\u5355\u7684\u5f0f\u5b50.\u5982\uff1a
\u4f8b2\u3001\u5f53\u65f6a2b+ab2-5a2b2=0,\u6c42 \u7684\u503c.
\u5206\u6790\uff1a\u672c\u9898\u5c31\u5c5e\u4e8e\u201c\u6240\u7ed9\u5df2\u77e5\u503c\u2018a2b+ab2-5a2b2=0\u2019\u662f\u4e00\u4e9b\u6bd4\u8f83\u590d\u6742\u7684\u6570\u503c\u201d,\u800c\u201c\u6240\u7ed9\u7684\u5206\u5f0f\u2018 \u2019\u5374\u662f\u4e00\u4e2a\u975e\u5e38\u7b80\u5355\u7684\u5f0f\u5b50.\u56e0\u6b64,\u5728\u6c42\u503c\u524d\u53ea\u9700\u8981\u5c06\u201c\u6240\u7ed9\u5df2\u77e5\u503c\u2018a2b+ab2-5a2b2=0\u2019 \u8fdb\u884c\u5316\u7b80\u6216\u53d8\u5f62\u540e,\u518d\u4ee3\u5165\u6240\u7ed9\u5206\u5f0f\u4e2d\u4fbf\u53ef\u6c42\u503c\u201d .
\u89e3\u6cd5\u4e00\uff1a\u65e2\u7136\u8981\u6c42\u5206\u5f0f \u7684\u503c,\u8bf4\u660e\u5206\u6bcdab\u22600,\u5426\u5219\u5206\u5f0f
\u6ca1\u6709\u610f\u4e49.
\u2234\u5728\u5f0f\u5b50a2b+ab2-5a2b2=0\u7684\u4e24\u8fb9\u540c\u65f6\u9664\u4ee5a2b2,
\u5f97 ,\u5373,\u2234 .
\u89e3\u6cd5\u4e8c\uff1a\u65e2\u7136\u8981\u6c42\u5206\u5f0f \u7684\u503c,\u8bf4\u660e\u5206\u6bcdab\u22600,\u5426\u5219\u5206\u5f0f
\u6ca1\u6709\u610f\u4e49.
\u2235a2b+ab2-5a2b2=0,\u2234ab(a+b-5ab)=0,\u5219a+b-5ab=0,\u5373a+b=5ab,\u5f53a+b=5ab\u65f6,\u539f\u5f0f .
\u70b9\u8bc4\uff1a\u6c42\u4e00\u4e2a\u5206\u5f0f\u7684\u503c,\u5f80\u5f80\u53ea\u8981\u5229\u7528\u5206\u5f0f\u7684\u6027\u8d28\u201c \u201d\u6216\u79f0\u4e4b\u4e3a\u7ea6\u5206\u7684\u65b9\u6cd5\u800c\u6c42\u5f97.
\u4f8b3\u3001\u5df2\u77e5\uff1ax2-7x+1=0,\u6c42 \u7684\u503c.
\u5206\u6790\uff1a\u672c\u9898\u5728\u9898\u578b\u4e0a\u4e0e\u201c\u4f8b2\u201d\u57fa\u672c\u76f8\u540c,\u4f46\u89e3\u9898\u7684\u65b9\u6cd5\u7565\u6709\u4e0d\u540c.
\u65e2\u7136\u8981\u6c42\u5206\u5f0f \u7684\u503c,\u8bf4\u660e\u5206\u6bcdx\u22600,\u5426\u5219\u5206\u5f0f \u6ca1\u6709\u610f\u4e49.
\u5728x2-7x+1=0\u7684\u4e24\u8fb9\u540c\u9664\u4ee5x,\u5f97\uff1a ,\u5219\u6709
,\u5373x-7+ =0,\u2234x+ =0 .
\u70b9\u8bc4\uff1a\u901a\u8fc7\u53d8\u5f62,\u5c06\u5df2\u77e5\u5f0f\u5b50\u8f6c\u5316\u4e3a\u6240\u8981\u6c42\u503c\u7684\u5f0f\u5b50\u800c\u81ea\u7136\u5730\u5f97\u5230\u6240\u6c42\u5206\u5f0f\u7684\u503c\u662f\u5206\u5f0f\u6c42\u503c\u9898\u4e00\u4e2a\u91cd\u8981\u7684\u89e3\u9898\u65b9\u6cd5.
3\u3001\u6240\u7ed9\u5df2\u77e5\u503c\u662f\u4e00\u4e9b\u6bd4\u8f83\u590d\u6742\u751a\u81f3\u662f\u975e\u5e38\u590d\u6742\u7684\u6570\u503c,\u5316\u7b80\u6216\u53d8\u5f62\u540e\u66f4\u6709\u5229\u4e8e\u51c6\u786e\u5730\u6c42\u51fa\u6240\u7ed9\u5206\u5f0f\u7684\u503c,\u4e0d\u4ec5\u5982\u6b64,\u800c\u4e14\u6240\u7ed9\u7684\u5206\u5f0f\u4e5f\u662f\u4e00\u4e2a\u8f83\u590d\u6742\u7684\u5f0f\u5b50.\u5982\uff1a
\u4f8b4\u3001\u5df2\u77e5\uff1a \u6c42 \u7684\u503c.
\u5206\u6790\uff1a\u672c\u9898\u5c5e\u4e8e\u201c\u6240\u7ed9\u5df2\u77e5\u503c \u662f\u6bd4\u8f83\u590d\u6742\u7684\u6570\u503c,\u53d8\u5f62\u540e\u66f4\u6709\u5229\u4e8e\u51c6\u786e\u5730\u6c42\u51fa\u6240\u7ed9\u5206\u5f0f \u7684\u503c,\u4e0d\u4ec5\u5982\u6b64,\u800c\u4e14\u6240\u7ed9\u7684\u5206\u5f0f \u4e5f\u662f\u4e00\u4e2a\u8f83\u590d\u6742\u7684\u5f0f\u5b50\u201d.\u56e0\u6b64,\u5148\u5c06 \u8fdb\u884c\u53d8\u5f62,\u53ef\u5f97x-y=-3xy,\u518d\u5c06\u6240\u7ed9\u5f0f\u5b50 \u8fdb\u884c\u53d8\u5f62,\u53ef\u5f97 = ,\u7136\u540e\u5c06\u5df2\u77e5\u5f0f\u5b50\u53d8\u5f62\u540e\u7684\u5f0f\u5b50\u4ee3\u5165,\u4fbf\u5f97\u5230\u4e86\u6240\u8981\u6c42\u7684\u5f0f\u5b50\u7684\u503c.
\u2235 ,\u2234x\u22600,y\u22600,\u5219xy\u22600.
\u2234\u5728 \u7684\u4e24\u8fb9\u540c\u65f6\u4e58\u4ee5xy,\u5f97\uff1ay-x=3xy,\u5373x-y=-3xy,
\u53c8\u2235 ,
\u2234\u5f53x-y=-3xy\u65f6,\u539f\u5f0f .
\u6ce8\u610f\uff1a\u672c\u9898\u4e5f\u53ef\u4ee5\u628a\u5b83\u770b\u4f5c\u662f\u4e0a\u8ff0\u7b2c1\u79cd\u7c7b\u578b\u7684\u9898\u76ee\u6765\u89e3,\u89e3\u6cd5\u5982\u4e0b\uff1a
\u2235 ,\u2234x\u22600,y\u22600,\u5219xy\u22600\uff0e\u5728\u7684 \u5206\u5b50\u3001\u5206\u6bcd\u540c\u65f6\u9664\u4ee5xy,\u5f97\uff1a
\u2234\u5f53 \u65f6,\u539f\u5f0f .
3ab-4ab+8ab-7ab+ab=______\uff0e
4\uff0e7x-(5x-5y)-y=______\uff0e
5\uff0e23a3bc2-15ab2c+8abc-24a3bc2-8abc=______\uff0e
6\uff0e-7x2+6x+13x2-4x-5x2=______\uff0e
7\uff0e2y+(-2y+5)-(3y+2)\uff1d______\uff0e
11\uff0e(2x2-3xy+4y2)+(x2+2xy-3y2)=______\uff0e
12\uff0e2a-(3a-2b+2)+(3a-4b-1)=______\uff0e
13\uff0e-6x2-7x2+15x2-2x2\uff1d______\uff0e
14\uff0e2x-(x+3y)-(-x-y)-(x-y)\uff1d______\uff0e
16\uff0e2x+2y-[3x-2(x-y)]=______\uff0e
17\uff0e5-(1-x)-1-(x-1)=______\uff0e
18\uff0e( )+(4xy+7x2-y2)=10x2-xy\uff0e
19\uff0e(4xy2-2x2y)-( )=x3-2x2y+4xy2+y3\uff0e
21\uff0e\u5df2\u77e5A=x3-2x2+x-4\uff0cB=2x3-5x+3\uff0c\u8ba1\u7b97A+B=______\uff0e
22\uff0e\u5df2\u77e5A=x3-2x2+x-4\uff0cB=2x3-5x+3\uff0c\u8ba1\u7b97A-B=______\uff0e
23\uff0e\u82e5a=-0.2\uff0cb=0.5\uff0c\u4ee3\u6570\u5f0f-(|a2b|-|ab2|)\u7684\u503c\u4e3a______\uff0e
25\uff0e\u4e00\u4e2a\u591a\u9879\u5f0f\u51cf\u53bb3m4-m3-2m+5\u5f97-2m4-3m3-2m2-1\uff0c\u90a3\u4e48\u8fd9\u4e2a\u591a\u9879\u5f0f\u7b49\u4e8e______\uff0e
26\uff0e-(2x2-y2)-[2y2-(x2+2xy)]=______\uff0e
27\uff0e\u82e5-3a3b2\u4e0e5ax-1by+2\u662f\u540c\u7c7b\u9879\uff0c\u5219x=______\uff0cy=______\uff0e
28\uff0e(-y+6+3y4-y3)-(2y2-3y3+y4-7)\uff1d______\uff0e
29\uff0e\u5316\u7b80\u4ee3\u6570\u5f0f4x2-[7x2-5x-3(1-2x+x2)]\u7684\u7ed3\u679c\u662f______\uff0e
30\uff0e2a-b2+c-d3=2a+( )-d3=2a-d3-( )=c-( )\uff0e
31\uff0e3a-(2a-3b)+3(a-2b)-b=______\uff0e
32\uff0e\u5316\u7b80\u4ee3\u6570\u5f0fx-[y-2x-(x+y)]\u7b49\u4e8e______\uff0e
33\uff0e[5a2+( )a-7]+[( )a2-4a+( )]=a2+2a+1\uff0e
34\uff0e3x-[y-(2x+y)]=______\uff0e
35\uff0e\u5316\u7b80|1-x+y|-|x-y|(\u5176\u4e2dx\uff1c0\uff0cy\uff1e0)\u7b49\u4e8e______\uff0e
36\uff0e\u5df2\u77e5x\u2264y\uff0cx+y-|x-y|=______\uff0e
37\uff0e\u5df2\u77e5x\uff1c0\uff0cy\uff1c0\uff0c\u5316\u7b80|x+y|-|5-x-y|=______\uff0e
38\uff0e4a2n-an-(3an-2a2n)\uff1d______\uff0e
39\uff0e\u82e5\u4e00\u4e2a\u591a\u9879\u5f0f\u52a0\u4e0a-3x2y+2x2-3xy-4\u5f97
2x2y+3xy2-x2+2xy\uff0c
\u5219\u8fd9\u4e2a\u591a\u9879\u5f0f\u4e3a______\uff0e
40\uff0e-5xm-xm-(-7xm)+(-3xm)=______\uff0e
41\uff0e\u5f53a=-1\uff0cb=-2\u65f6\uff0c
[a-(b-c)]-[-b-(-c-a)]\uff1d______\uff0e
43\uff0e\u5f53a=-1\uff0cb=1\uff0cc=-1\u65f6\uff0c
-[b-2(-5a)]-(-3b+5c)\uff1d______\uff0e
44\uff0e-2(3x+z)-(-6x)+(-5y+3z)=______\uff0e
45\uff0e-5an-an+1-(-7an+1)+(-3an)\uff1d______\uff0e
46\uff0e3a-(2a-4b-6c)+3(-2c+2b)=______\uff0e
48\uff0e9a2+[7a2-2a-(-a2+3a)]=______\uff0e
50\uff0e\u5f532y-x=5\u65f6\uff0c5(x-2y)2-3(-x+2y)-100=______\uff0e
(\u4e8c)\u9009\u62e9
[ ]
A\uff0e2\uff1b
B\uff0e-2\uff1b
C\uff0e-10\uff1b
D\uff0e-6\uff0e
52\uff0e\u4e0b\u5217\u5404\u5f0f\u4e2d\u8ba1\u7b97\u7ed3\u679c\u4e3a-7x-5x2+6x3\u7684\u662f [ ]
A\uff0e3x-(5x2+6x3-10x)\uff1b
B\uff0e3x-(5x2+6x3+10x)\uff1b
C\uff0e3x-(5x2-6x3+10x)\uff1b
D\uff0e3x-(5x2-6x3-10x)\uff0e
53\uff0e\u628a(-x-y)+3(x+y)-5(x+y)\u5408\u5e76\u540c\u7c7b\u9879\u5f97 [ ]
A\uff0e(x-y)-2(x+y)\uff1b
B\uff0e-3(x+y)\uff1b
C\uff0e(-x-y)-2(x+y)\uff1b
D\uff0e3(x+y)\uff0e
54\uff0e2a-[3b-5a-(2a-7b)]\u7b49\u4e8e [ ]
A\uff0e-7a+10b\uff1b
B\uff0e5a+4b\uff1b
C\uff0e-a-4b\uff1b
D\uff0e9a-10b\uff0e
55\uff0e\u51cf\u53bb-3m\u7b49\u4e8e5m2-3m-5\u7684\u4ee3\u6570\u5f0f\u662f [ ]
A\uff0e5(m2-1)\uff1b
B\uff0e5m2-6m-5\uff1b
C\uff0e5(m2+1)\uff1b
D\uff0e-(5m2+6m-5)\uff0e
56\uff0e\u5c06\u591a\u9879\u5f0f2ab-9a2-5ab-4a2\u4e2d\u7684\u540c\u7c7b\u9879\u5206\u522b\u7ed3\u5408\u5728\u4e00\u8d77\uff0c\u5e94\u4e3a [ ]
A\uff0e(9a2-4a2)+(-2ab-5ab)\uff1b
B\uff0e(9a2+4a2)-(2ab-5ab)\uff1b
C\uff0e(9a2-4a2)-(2ab+5ab)\uff1b
D\uff0e(9a2-4a2)+(2ab-5ab)\uff0e
57\uff0e\u5f53a=2\uff0cb=1\u65f6\uff0c-a2b+3ba2-(-2a2b)\u7b49\u4e8e [ ]
A\uff0e20\uff1b
B\uff0e24\uff1b
C\uff0e0\uff1b
D\uff0e16\uff0e
\u4e2d\uff0c\u6b63\u786e\u7684\u9009\u62e9\u662f [ ]
A\uff0e\u6ca1\u6709\u540c\u7c7b\u9879\uff1b
B\uff0e(2)\u4e0e(4)\u662f\u540c\u7c7b\u9879\uff1b
C\uff0e(2)\u4e0e(5)\u662f\u540c\u7c7b\u9879\uff1b
D\uff0e(2)\u4e0e(4)\u4e0d\u662f\u540c\u7c7b\u9879\uff0e
59\uff0e\u82e5A\u548cB\u5747\u4e3a\u4e94\u6b21\u591a\u9879\u5f0f\uff0c\u5219A-B\u4e00\u5b9a\u662f [ ]
A\uff0e\u5341\u6b21\u591a\u9879\u5f0f\uff1b
B\uff0e\u96f6\u6b21\u591a\u9879\u5f0f\uff1b
C\uff0e\u6b21\u6570\u4e0d\u9ad8\u4e8e\u4e94\u6b21\u7684\u591a\u9879\u5f0f\uff1b
D\uff0e\u6b21\u6570\u4f4e\u4e8e\u4e94\u6b21\u7684\u591a\u9879\u5f0f\uff0e
60\uff0e-\uff5b[-(x+y)]\uff5d+\uff5b-[(x+y)]\uff5d\u7b49\u4e8e [ ]
A\uff0e0\uff1b
B\uff0e-2y\uff1b
C\uff0ex+y\uff1b
D\uff0e-2x-2y\uff0e
61\uff0e\u82e5A=3x2-5x+2\uff0cB=3x2-5x+6\uff0c\u5219A\u4e0eB\u7684\u5927\u5c0f\u662f
[ ]
A\uff0eA\uff1eB\uff1b
B\uff0eA=B\uff1b
C\uff0eA\uff1cB\uff1b
D\uff0e\u65e0\u6cd5\u786e\u5b9a\uff0e
62\uff0e\u5f53m=-1\u65f6\uff0c-2m2-[-4m2+(-m2)]\u7b49\u4e8e [ ]
A\uff0e-7\uff1b
B\uff0e3\uff1b
C\uff0e1\uff1b
D\uff0e2\uff0e
63\uff0e\u5f53m=2\uff0cn=1\u65f6\uff0c\u591a\u9879\u5f0f-m-[-(2m-3n)]+[-(-3m)-4n]\u7b49\u4e8e [ ]
A\uff0e1\uff1b
B\uff0e9\uff1b
C\uff0e3\uff1b
D\uff0e5\uff0e
[ ]
65\uff0e-5an-an-(-7an)+(-3an)\u7b49\u4e8e [ ]
A\uff0e-16an\uff1b
B\uff0e-16\uff1b
C\uff0e-2an\uff1b
D\uff0e-2\uff0e
66\uff0e(5a-3b)-3(a2-2b)\u7b49\u4e8e [ ]
A\uff0e3a2+5a+3b\uff1b
B\uff0e2a2+3b\uff1b
C\uff0e2a3-b2\uff1b
D\uff0e-3a2+5a-5b\uff0e
67\uff0ex3-5x2-4x+9\u7b49\u4e8e [ ]
A\uff0e(x3-5x2)-(-4x+9)\uff1b
B\uff0ex3-5x2-(4x+9)\uff1b
C\uff0e-(-x3+5x2)-(4x-9)\uff1b
D\uff0ex3+9-(5x2-4x)\uff0e
[ ]
69\uff0e4x2y-5xy2\u7684\u7ed3\u679c\u5e94\u4e3a [ ]
A\uff0e-x2y\uff1b
B\uff0e-1\uff1b
C\uff0e-x2y2\uff1b
D\uff0e\u4ee5\u4e0a\u7b54\u6848\u90fd\u4e0d\u5bf9\uff0e
(\u4e09)\u5316\u7b80
70\uff0e(4x2-8x+5)-(x3+3x2-6x+2)\uff0e
72\uff0e(0.3x3-x2y+xy2-y3)-(-0.5x3-x2y+0.3xy2)\uff0e
73\uff0e-{2a2b-[3abc-(4ab2-a2b)]\uff5d\uff0e
74\uff0e(5a2b+3a2b2-ab2)-(-2ab2+3a2b2+a2b)\uff0e
75\uff0e(x2-2y2-z2)-(-y2+3x2-z2)+(5x2-y2+2z2)\uff0e
76\uff0e(3a6-a4+2a5-4a3-1)-(2-a+a3-a5-a4)\uff0e
77\uff0e(4a-2b-c)-5a-[8b-2c-(a+b)]\uff0e
78\uff0e(2m-3n)-(3m-2n)+(5n+m)\uff0e
79\uff0e(3a2-4ab-5b2)-(2b2-5a2+2ab)-(-6ab)\uff0e
80\uff0exy-(2xy-3z)+(3xy-4z)\uff0e
81\uff0e(-3x3+2x2-5x+1)-(5-6x-x2+x3)\uff0e
83\uff0e3x-(2x-4y-6x)+3(-2z+2y)\uff0e
84\uff0e(-x2+4+3x4-x3)-(x2+2x-x4-5)\uff0e
85\uff0e\u82e5A=5a2-2ab+3b2\uff0cB=-2b2+3ab-a2\uff0c\u8ba1\u7b97A+B\uff0e
86\uff0e\u5df2\u77e5A=3a2-5a-12\uff0cB=2a2+3a-4\uff0c\u6c422(A-B)\uff0e
87\uff0e2m-{-3n+[-4m-(3m-n)]\uff5d\uff0e
88\uff0e5m2n+(-2m2n)+2mn2-(+m2n)\uff0e
89\uff0e4(x-y+z)-2(x+y-z)-3(-x-y-z)\uff0e
90\uff0e2(x2-2xy+y2-3)+(-x2+y2)-(x2+2xy+y2)\uff0e
92\uff0e2(a2-ab-b2)-3(4a-2b)+2(7a2-4ab+b2)\uff0e
94\uff0e4x-2(x-3)-3[x-3(4-2x)+8]\uff0e
(\u56db)\u5c06\u4e0b\u5217\u5404\u5f0f\u5148\u5316\u7b80\uff0c\u518d\u6c42\u503c
97\uff0e\u5df2\u77e5a+b=2\uff0ca-b=-1\uff0c\u6c423(a+b)2(a-b)2-5(a+b)2\u00d7(a-b)2\u7684\u503c\uff0e
98\uff0e\u5df2\u77e5A=a2+2b2-3c2\uff0cB=-b2-2c2+3a2\uff0cC=c2+2a2-3b2\uff0c\u6c42(A-B)+C\uff0e
99\uff0e\u6c42(3x2y-2xy2)-(xy2-2x2y)\uff0c\u5176\u4e2dx=-1\uff0cy=2\uff0e
101\uff0e\u5df2\u77e5|x+1|+(y-2)2=0\uff0c\u6c42\u4ee3\u6570\u5f0f5(2x-y)-3(x-4y)\u7684\u503c\uff0e
106\uff0e\u5f53P=a2+2ab+b2\uff0cQ=a2-2ab-b2\u65f6\uff0c\u6c42P-[Q-2P-(P-Q)]\uff0e
107\uff0e\u6c422x2-\uff5b-3x+5+[4x2-(3x2-x-1)]\uff5d\u7684\u503c\uff0c\u5176\u4e2dx=-3\uff0e
110\uff0e\u5f53x=-2\uff0cy=-1\uff0cz=3\u65f6\uff0c\u6c425xyz-\uff5b2x2y-[3xyz-(4xy2-x2y)]\uff5d\u7684\u503c\uff0e
113\uff0e\u5df2\u77e5A=x3-5x2\uff0cB=x2-6x+3\uff0c\u6c42A-3(-2B)\uff0e
(\u4e94)\u7efc\u5408\u7ec3\u4e60
115\uff0e\u53bb\u62ec\u53f7\uff1a\uff5b-[-(a+b)]\uff5d-\uff5b-[-(a-b)]\uff5d\uff0e
116\uff0e\u53bb\u62ec\u53f7\uff1a-[-(-x)-y]-[+(-y)-(+x)]\uff0e
117\uff0e\u5df2\u77e5A=x3+6x-9\uff0cB=-x3-2x2+4x-6\uff0c\u8ba1\u7b972A-3B\uff0c\u5e76\u628a\u7ed3\u679c\u653e\u5728\u524d\u9762\u5e26\u201c-\u201d\u53f7\u7684\u62ec\u53f7\u5185\uff0e
118\uff0e\u8ba1\u7b97\u4e0b\u5f0f\uff0c\u5e76\u628a\u7ed3\u679c\u653e\u5728\u524d\u9762\u5e26\u201c-\u201d\u53f7\u7684\u62ec\u53f7\u5185\uff1a
(-7y2)+(-4y)-(-y2)-(+5y)+(-8y2)+(+3y)\uff0e
119\uff0e\u53bb\u62ec\u53f7\u3001\u5408\u5e76\u540c\u7c7b\u9879\uff0c\u5c06\u7ed3\u679c\u6309x\u7684\u5347\u5e42\u6392\u5217\uff0c\u5e76\u628a\u540e\u4e09\u9879\u653e\u5728\u5e26\u6709\u201c-\u201d\u53f7\u7684\u62ec\u53f7\u5185\uff1a
120\uff0e\u4e0d\u6539\u53d8\u4e0b\u5f0f\u7684\u503c\uff0c\u5c06\u5176\u4e2d\u5404\u62ec\u53f7\u524d\u7684\u7b26\u53f7\u90fd\u53d8\u6210\u76f8\u53cd\u7684\u7b26\u53f7\uff1a(x3+3x2)-(3x2y-7xy)+(2y3-3y2)\uff0e
121\uff0e\u628a\u591a\u9879\u5f0f4x2y-2xy2+4xy+6-x2y2+x3-y2\u7684\u4e09\u6b21\u9879\u653e\u5728\u524d\u9762\u5e26\u6709\u201c-\u201d\u53f7\u7684\u62ec\u53f7\u5185\uff0c\u4e8c\u6b21\u9879\u653e\u5728\u524d\u9762\u5e26\u6709\u201c+\u201d\u53f7\u7684\u62ec\u53f7\u5185\uff0c\u56db\u6b21\u9879\u548c\u5e38\u6570\u9879\u653e\u5728\u524d\u9762\u5e26\u6709\u201c-\u201d\u53f7\u7684\u62ec\u53f7\u5185\uff0e
122\uff0e\u628a\u4e0b\u5217\u591a\u9879\u5f0f\u7684\u62ec\u53f7\u53bb\u6389\uff0c\u5408\u5e76\u540c\u7c7b\u9879\uff0c\u5e76\u5c06\u5176\u5404\u9879\u653e\u5728\u524d\u9762\u5e26\u6709\u201c-\u201d\u53f7\u7684\u62ec\u53f7\u5185\uff0c\u518d\u6c422x-2[3x-(5x2-2x+1)]-4x2\u7684\u503c\uff0c\u5176\u4e2dx=-1\uff0e
123\uff0e\u5408\u5e76\u540c\u7c7b\u9879\uff1a
7x-1.3z-4.7-3.2x-y+2.1z+5-0.1y\uff0e
124\uff0e\u5408\u5e76\u540c\u7c7b\u9879\uff1a5m2n+5mn2-mn+3m2n-6mn2-8mn\uff0e
126\uff0e\u53bb\u62ec\u53f7\uff0c\u5408\u5e76\u540c\u7c7b\u9879\uff1a
(1)(m+1)-(-n+m)\uff1b
(2)4m-[5m-(2m-1)]\uff0e
127\uff0e\u5316\u7b80\uff1a2x2-\uff5b-3x-[4x2-(3x2-x)+(x-x2)]\uff5d\uff0e
128\uff0e\u5316\u7b80\uff1a-(7x-y-2z)-\uff5b[4x-(x-y-z)-3x+z]-x\uff5d\uff0e
129\uff0e\u8ba1\u7b97\uff1a(+3a)+(-5a)+(-7a)+(-31a)-(+4a)-(-8a)\uff0e
130\uff0e\u5316\u7b80\uff1aa3-(a2-a)+(a2-a+1)-(1-a4+a3)\uff0e
131\uff0e\u5c06x2-8x+2x3-13x2-2x-2x3+3\u5148\u5408\u5e76\u540c\u7c7b\u9879\uff0c\u518d\u6c42\u503c\uff0c\u5176\u4e2dx=-4\uff0e
132\uff0e\u5728\u62ec\u53f7\u5185\u586b\u4e0a\u9002\u5f53\u7684\u9879\uff1a[( )-9y+( )]+2y2+3y-4=11y2-( )+13\uff0e
133\uff0e\u5728\u62ec\u53f7\u5185\u586b\u4e0a\u9002\u5f53\u7684\u9879\uff1a
(-x+y+z)(x+y-z)=[y-( )][y+( )]\uff0e
134\uff0e\u5728\u62ec\u53f7\u5185\u586b\u4e0a\u9002\u5f53\u7684\u9879\uff1a
(3x2+xy-7y2)-( )=y2-2xy-x2\uff0e
135\uff0e\u5728\u62ec\u53f7\u5185\u586b\u4e0a\u9002\u5f53\u7684\u9879\uff1a
(1)x2-xy+y-1=x2-( )\uff1b
(2)[( )+6x-7]-[4x2+( )-( )]=x2-2x+1\uff0e
136\uff0e\u8ba1\u7b974x2-3[x+4(1-x)-x2]-2(4x2-1)\u7684\u503c\uff0e
137\uff0e\u5316\u7b80\uff1a
138\uff0e\u7528\u7ad6\u5f0f\u8ba1\u7b97
(-x+5+2x4-6x3)-(3x4+2x2-3x3-7)\uff0e
139\uff0e\u5df2\u77e5A=11x3+8x2-6x+2\uff0cB=7x3-x2+x+3\uff0c\u6c422(3A-2B)\uff0e
140\uff0e\u5df2\u77e5A=x3-5x2\uff0cB=x3-11x+6\uff0cC=4x-3\uff0c\u6c42
(1)A-B-C\uff1b
(2)(A-B-C)-(A-B+C)\uff0e
141\uff0e\u5df2\u77e5A=3x2-4x3\uff0cB=x3-5x2+2\uff0c\u8ba1\u7b97
(1)A+B\uff1b
(2)B-A\uff0e
142\uff0e\u5df2\u77e5x\uff1c-4\uff0c\u5316\u7b80|-x|+|x+4|-|x-4|\uff0e
而分式方程才有可能出现这种情况。此时写，检验，当x= （结果）的时候，原方程分母=0，是增根，所以原方程无解。
另外，我还考虑到你是不是出现把分式方程用分式化简的方法做了。解分式方程需要方程项数同时乘以最大公分母，然后解出。而分式化简则是通分，在需要的项 分数线上下同时乘以最大公分母的缺少部分，然后通分，化简。一般这种题的考点在于通分，所以答案都是倒过来算的，给的一般是好算的结果。
w要不就是化错了 对的话那就是无解了
因为在你对分化简通分时没有注意到分母不能为零,导致了结果产生了增根.
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绛旓細鈶 绾﹀垎閿 鈶 a鍙栧涓嶈兘涓1锛宎=1鏃鍒嗗紡鏃犳剰涔 瑙ｏ細绛旀涓猴細鈶紝绾﹀垎閿欙紱鈶ｏ紝a鍙栧间笉鑳戒负1锛宎=1鏃跺垎寮忔棤鎰忎箟锛庢纭В棰樿繃绋嬶細鍘熷紡=ab脳a+1(a+1)(a-1)•a-1ab2 =1b 褰揳=2锛宐=1鏃讹紝鍘熷紡=1锛
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