求初一上学期一元一次方程，化简求值附整体答案各十五道 跪求！！七年级上学期数学解一元一次方程、有理数混合运算、化简...
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1\uff0e\uff082005•\u5b81\u5fb7\uff09\u89e3\u65b9\u7a0b\uff1a2x+1=7
2\uff0e
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5\uff0e\u89e3\u65b9\u7a0b
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6\uff0e\uff081\uff09\u89e3\u65b9\u7a0b\uff1a3\uff08x\ufe631\uff09=2x+3\uff1b
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7\uff0e\ufe63\uff081\ufe632x\uff09=\uff083x+1\uff09
8\uff0e\u89e3\u65b9\u7a0b\uff1a
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9\uff0e\u89e3\u65b9\u7a0b\uff1a\uff0e
10\uff0e\u89e3\u65b9\u7a0b\uff1a
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11\uff0e\u8ba1\u7b97\uff1a
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\uff082\uff09\u89e3\u65b9\u7a0b\uff1a
12\uff0e\u89e3\u65b9\u7a0b\uff1a
13\uff0e\u89e3\u65b9\u7a0b\uff1a
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14\uff0e\u89e3\u65b9\u7a0b\uff1a\uff081\uff095\uff082x+1\uff09\ufe632\uff082x\ufe633\uff09=6
\uff082\uff09+2
\uff083\uff09[3\uff08x\ufe63\uff09+]=5x\ufe631
15\uff0e\uff08A\u7c7b\uff09\u89e3\u65b9\u7a0b\uff1a5x\ufe632=7x+8\uff1b
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16\uff0e\u89e3\u65b9\u7a0b
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\uff082\uff09
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17\uff0e\u89e3\u65b9\u7a0b\uff1a
\uff081\uff09\u89e3\u65b9\u7a0b\uff1a4x\ufe633\uff085\ufe63x\uff09=13
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18\uff0e\uff081\uff09\u8ba1\u7b97\uff1a\ufe6342\u00d7+|\ufe632|3\u00d7\uff08\ufe63\uff093
\uff082\uff09\u8ba1\u7b97\uff1a\ufe6312\ufe63|0.5\ufe63|\u00f7\u00d7[\ufe632\ufe63\uff08\ufe633\uff092]
\uff083\uff09\u89e3\u65b9\u7a0b\uff1a4x\ufe633\uff085\ufe63x\uff09=2\uff1b
\uff084\uff09\u89e3\u65b9\u7a0b\uff1a\uff0e
19\uff0e\uff081\uff09\u8ba1\u7b97\uff1a\uff081\ufe632\ufe634\uff09\u00d7\uff1b
\uff082\uff09\u8ba1\u7b97\uff1a\u00f7\uff1b
\uff083\uff09\u89e3\u65b9\u7a0b\uff1a3x+3=2x+7\uff1b
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20\uff0e\u89e3\u65b9\u7a0b\uff081\uff09\ufe630.2\uff08x\ufe635\uff09=1\uff1b
\uff082\uff09\uff0e
21\uff0e\u89e3\u65b9\u7a0b\uff1a\uff08x+3\uff09\ufe632\uff08x\ufe631\uff09=9\ufe633x\uff0e
22\uff0e8x\ufe633=9+5x\uff0e
5x+2\uff083x\ufe637\uff09=9\ufe634\uff082+x\uff09\uff0e
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23\uff0e\u89e3\u4e0b\u5217\u65b9\u7a0b\uff1a
\uff081\uff090.5x\ufe630.7=5.2\ufe631.3\uff08x\ufe631\uff09\uff1b
\uff082\uff09=\ufe632\uff0e
24\uff0e\u89e3\u65b9\u7a0b\uff1a
\uff081\uff09\ufe630.5+3x=10\uff1b
\uff082\uff093x+8=2x+6\uff1b
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\uff084\uff09\uff0e
25\uff0e\u89e3\u65b9\u7a0b\uff1a\uff0e
26\uff0e\u89e3\u65b9\u7a0b\uff1a\uff081\uff0910x\ufe6312=5x+15\uff1b\uff08\u7cbe\u00b7\u00b7\u00b7\u9510\uff09
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7(2x-1)-3(4x-1)=4(3x+2)-1
(5y+1)+ (1-y)= (9y+1)+ (1-3y)
[ (- 2)-4 ]=x+2
20%+(1-20%)(320-x)=320\u00d740%
2(x-2)+2=x+1
6.2(x-2)-3(4x-1)=9(1-x)
7.11x+64-2x=100-9x
15-(8-5x)=7x+(4-3x)
3(x-7)-2[9-4(2-x)]=22
3/2[2/3(1/4x-1)-2]-x=2
5x+1-2x=3x-2
3y-4=2y+1
87X*13=5
7Z/93=41
15X+863-65X=54
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\uff08\uff0d12\uff09+27
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67+\uff08\uff0d92\uff09
(\uff0d27.8)+43.9
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|+6\uff08\uff0d7\uff09|
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38+\uff08\uff0d22\uff09+\uff08+62\uff09+\uff08\uff0d78\uff09
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6+\uff08\uff0d7\uff09+\uff089\uff09+2
(x3-4x2y+5xy2-3y3)-(-2xy2-4x3+x2y)\uff1b
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(2x2-x-1)-(x2-x- )+3(x2-1 ),\u5176\u4e2dx=1 \u3002
-9(x-2)-y(x-5)
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\uff082\uff09\u5f53x=5\u65f6\uff0c\u6c42y\u7684\u89e3\u3002
5(9+a)\u00d7b-5(5+b)\u00d7a
\uff081\uff09\u5316\u7b80\u6574\u4e2a\u5f0f\u5b50\u3002
\uff082\uff09\u5f53a=5/7\u65f6\uff0c\u6c42\u5f0f\u5b50\u7684\u503c\u3002
62g+62(g+b)-b
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\uff082\uff09\u5f53g=5/7\u65f6\uff0c\u6c42b\u7684\u89e3\u3002
3(x+y)-5(4+x)+2y
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(2)\u5f53x=7\u65f6\uff0cy=-4\u3002
(x+y)(x-y)
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(2)\u5f53a=4\u65f6\uff0cb=-2\u3002
2ab+a\u00d7a-b
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(2)\u5f53x=5\u65f6\uff0cy=-2\u3002
5.6x+4(x+y)-y
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(2)\u5f53x=5\u65f6\uff0cy=-2\u3002
6.4(x+2.9)-y+2(x-y)
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(2)\u5f53x=5\u65f6\uff0cy=2\u3002
(2.5+x)(5.2+y)
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(2)\u5f53x=5\u65f6\uff0cy=2\u3002
xy+3x-3(x+Y)
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(2)\u5f53x=5\u65f6\uff0c\u6c42y\u7684\u89e3\u3002
3(x+y)+2(x-y)+3xy
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(2)\u5f53x=5\u65f6\uff0c\u6c42y\u7684\u89e3\u3002
x+y-3(x-y)
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(2)\u5f53x=5\u65f6\uff0cy=2\u3002
1. 2(x-2)-3(4x-1)=9(1-x)
4x-4-12x+3=9-9x
-8x+9x=9-3+4
x=10
2. 11x+64-2x=100-9x
11x-2x+9x=100-64
18x=36
x=2
3. 15-(8-5x)=7x+(4-3x)
15-8+5x=7x+4-3x
5x-7x+3x=4-15+8
x=-3
4. 3(x-7)-2[9-4(2-x)]=22
3x-21-2(9-8+4x)=22
3x-21-18+16-8x=22
-5x=22+23
-5x=45
x=-9
6. 2(x-2)+2=x+1
2x-4+2=x+1
2x-x=1+4-2
x=3
7. 0.4(x-0.2)+1.5=0.7x-0.38
0.4x-0.08+1.5=0.7x-0.38
-0.3x=0.08-0.38-1.5
-0.3x=-1.8
x=6
8. 30x-10(10-x)=100
30x-100+10x=100
40x=200
x=5
9. 4(x+2)=5(x-2)
4x+8=5x-10
x=18
10. 120-4(x+5)=25
120-4x-20=25
4x=120-20-25
4x=75
x=18.75
11. 15x+863-65x=54
-50x=-863-54
-50x=-917
x=58.64
12. 12.3(x-2)+1=x-(2x-1)
12.3x-24.6+1=-x+1
4x=24.6
x=6.15
13. 11x+64-2x=100-9x
9x+9x=100-64
18x=36
x=2
14. 14.59+x-25.31=0
x-10.72=0
x=10.72
15. x-48.32+78.51=80
x+30.19=80
x=49.81
1.（3X+2Y)+(4X+3Y)其中X=5,Y+3
解：原式=3X+2Y+4X+3Y=7X+5Y
当X=5,Y=3时
原式=5*7+（-3）*5+20
2.(5a^2-3b^2)+(a^2+b^2)-(5a^2+3b^2),其中a=-1,b=1
=5a^2-3b^2+a^2+b^2-5a^2-3b^2
=a^2-5b^2
=(-1)^2-5*1^2
=1-5
=-4
3.2(a^2b+ab^2)-2(a^2 b-1)-2ab^2 -2其中a=-2,b=2
=2a^2b+2ab^2-2a^2b+2-2ab^2-2
=0
化简求值附整体答案：
1、已知A,B是方程x^2+2x-5=0的两个实数根,
求(A^2+2AB+2A)(B^2+2AB+2B)的值.
由A,B是方程x^2+2x-5=0的两个实数根得：
AB=-5，A+B=-2
A^2+2AB+2A)(B^2+2AB+2B)
=AB（A+2B+2）（B+2A+2）
=-5（-2+B+2）（-2+A+2）
=-5AB
=25
2、1/2(x+y+z)方+1/2(x-y-z)(x-y+z)-z(x+y),其中x-y=6,xy=21.要详细步骤
化简得：
1/2(x+y+z)方+1/2(x-y-z)(x-y+z)-z(x+y)=
1/2[(x+y)方+2z(x+y)+z方]+1/2[(x-y)方-z方]-z(x+y)=
1/2(x+y)方+1/2(x-y)方=x方＋y方
由x-y=6,xy=21得，x方＋y方＝（x-y）方＋2xy＝78
3、a^2-ab+2b^2=3 求2ab-2a^2-4b^2-7的值
2ab-2a^2-4b^2-7
=2(ab-a^2-2b^2)-7
=-2(a^2-ab+2b^2)-7
=(-2)*3-7
=-6-7=-13
4、若A=2x^2+3xy-2x-3,B=-x^2+xy+2,且3A+6B的值与x无关，求y的值
解：
3A+6B=6x^2+9xy-6x-9-6x^2+6xy+12
=15xy-6x+3
=x(15y-6)+3
5、9x+6x^2 -3(x-2/3x^2).其中x=-2
9x+6x² -3(x-2/3x²)
=9x+6x²-3x+2x²
=8x²+6x
=8×(-2)²+6×(-2)
=32-12
=20
6、1/4(-4x^2+2x-8)-(1/2x-1),其中x=1/2
1/4(-4x²+2x-8)-(1/2x-1)
=-x²+1/2x-2-1/2x+1
=-x²-1
=-(1/2)²-1
=-1/4-1
=-5/4
7、3x'y-[2x'y-(2xyz-x'z)-4x'z]-xyz,其中x=-2,y=-3,z=1,
:3x'y-[2x'y-(2xyz-x'z)-4x'z]-xyz
=3x'y-2x'y+2xyz-x'z+4x'z-xyz
=x'y-xyz+3x'z
=4*(-3)-2*3*1+3*4*1
=-12-6+12
=-6
8、(5a^2-3b^2)+(a^2+b^2)-(5a^2+3b^2),其中a=-1,b=1
=5a^2-3b^2+a^2+b^2-5a^2-3b^2
=a^2-5b^2
=(-1)^2-5*1^2
=1-5
=-4
9、2(a^2b+ab^2)-2(a^2 b-1)-2ab^2 -2其中a=-2,b=2
=2a^2b+2ab^2-2a^2b+2-2ab^2-2
=0
10、(X-2分之1Y-1)(X-2分之1Y+1)-(X-2分之1Y-1)的平方
其中X=1.7,Y=3.9(先化简再求值)
[(X-2分之1Y)-1][(X+2分之1Y)+1]-(X-2分之1Y-1)平方
=(X+2分之1Y)平方-1-(X-2分之1Y)平方+2(X-2分之1Y)-1
=(X+2分之1Y)平方-(X-2分之1Y)平方+2(X-2分之1Y)-2
=2XY+2X-Y-2
=3.9*2.4+1.4
=10.76
11.（3X+2Y)+(4X+3Y)其中X=5,Y+3
解：原式=3X+2Y+4X+3Y=7X+5Y
当X=5,Y=3时
原式=5*7+（-3）*5+20
12.(5a^2-3b^2)+(a^2+b^2)-(5a^2+3b^2),其中a=-1,b=1
=5a^2-3b^2+a^2+b^2-5a^2-3b^2
=a^2-5b^2
=(-1)^2-5*1^2
=1-5
=-4
13.2(a^2b+ab^2)-2(a^2 b-1)-2ab^2 -2其中a=-2,b=2
=2a^2b+2ab^2-2a^2b+2-2ab^2-2
=0
14.2a-（3a-2b+2）+（3a-4b-1) =（ ），a=b=1
=2a-3a+2b-2+3a-4b-1
=（2-3+3）a+（2-4）b+（-2-1）
=2a-2b-3=-3
15.5-(1-x)-1-(x-1）,x=11
=5-1+x-1-x+1
=4
③2x-(x+3y)-(-x-y)-(x-y)=（ ）
=2x-x+3y+x+y-x+y
=x+5y
绛旓細涓鍏冧竴娆℃柟绋嬶細1. 2(x-2)-3(4x-1)=9(1-x)4x-4-12x+3=9-9x -8x+9x=9-3+4 x=10 2. 11x+64-2x=100-9x 11x-2x+9x=100-64 18x=36 x=2 3. 15-(8-5x)=7x+(4-3x)15-8+5x=7x+4-3x 5x-7x+3x=4-15+8 x=-3 4. 3(x-7)-2[9-4(2-x)]=22 3x-21-...
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绛旓細9.(1/3)x/12=(1/3)x/[12*(5/4)]+1 鍖栫畝寰楋細(5/3)x=(4/3)x+60 (1/3)x=60 x=180 10.2X+5X=14000 7X=14000 X=2000 2X=4000 5X=10000 11. x+(35-20)*1.5%x=1323 x=1080 12 . 2x-10.3x=15 13 . 0.52x-(1-0.52)x=80 14 . x/2+3x/2=7 15 . 3x+7=...
绛旓細3.绉婚」锛氭妸鍚湁鏈煡鏁扮殑椤归兘绉诲埌鏂圭▼鐨勪竴杈锛屽叾浠栭」閮界Щ鍒版柟绋嬬殑鍙︿竴杈癸紱瑁ゅ洶绉婚」瑕佸彉鍙 4.鍚堝苟鍚岀被椤癸細鎶婃柟绋嬪寲鎴恆x=b锛坅鈮0锛夌殑褰㈠紡锛5.绯绘暟鍖栨垚1锛氬湪鏂圭▼涓よ竟閮介櫎浠ユ湭鐭ユ暟鐨勭郴鏁癮锛屽緱鍒版柟绋嬬殑瑙=b/a銆傝В涓鍏冧竴娆℃柟绋嬮熻鍙ｈ瘈 鍏堝幓鍒嗘瘝鍐嶆嫭鍙凤紝绉婚」鍚堝苟鍚岀被椤广傜郴鏁板寲1杩樻病濂斤紝鍑嗙‘鏃犺涓...
绛旓細涓よ竟涔樹互56 鍗7*3锛圶+5锛=8*2X+5*56 鍗21锛圶+5)=16X+5*56 鍗5X+5*21=5*56 鎵浠=35 (涓よ竟鍚屼箻浠56浠ュ悗涓嶈璁＄畻鍑烘潵锛屼繚鐣欎竴涓嬶紝绾﹀幓鍏嶆暟鍗冲彲锛岃繖鏍蜂笉瀹规槗鍑洪敊)
绛旓細A 锛圓x骞虫柟-2xy+y骞虫柟锛-锛-x骞虫柟+Bxy+2y骞虫柟锛=5x骞虫柟-9xy+Cy骞虫柟 鍖栫畝寰楋細Ax^2-2xy+y^2+x^2-Bxy-2y^2 =(A+1)X^2-(2+B)xy-y^2=5x骞虫柟-9xy+Cy骞虫柟 鎵浠=4 B=7 C=-1
绛旓細涓鍏冧竴娆℃柟绋鍙湁涓涓牴銆備竴鍏冧竴娆℃柟绋嬪彲浠ヨВ鍐崇粷澶у鏁扮殑宸ョ▼闂銆佽绋嬮棶棰樸佸垎閰嶉棶棰樸佺泩浜忛棶棰樸佺Н鍒嗚〃闂銆佺數璇濊璐归棶棰樸佹暟瀛楅棶棰樸傚彧鍚湁涓涓湭鐭ユ暟锛屼笖鏈煡鏁扮殑楂樻鏁版槸1锛岀瓑鍙蜂袱闈㈤兘鏄暣寮忥紝杩欐牱鐨勬柟绋嬪彨鍋氫竴鍏冧竴娆℃柟绋.鍏朵竴鑸舰寮忎负锛歛x+b=0锛坅鈮0锛夛紝鏈夋椂涔熷啓浣滐細ax=b锛坅鈮0锛...
绛旓細4X+16=2X+32 4X-16=2X X=8 8+8+8=24(宀侊級24*2=48锛堝瞾锛 绛旓細鐜板湪鐖哥埜48宀侊紝鍎垮瓙24宀 2.宸茬煡X=2锛岄偅涔1/2锛坅-X锛=1/3锛坆x-3锛鍖栫畝锛寰楋細1/2a-1=b-1鍒╃敤绛夊紡鐨勬ц川1 鍒欑瓑浜庯細0.5a=b锛岄偅涔坆/a=0.5 a/b=1/0.5=2 鍒欙紙b/a锛-锛坅/b锛=0.5-2=-1.5 鍙傝冭祫鏂...
绛旓細涓涓椤瑰紡鍑忓幓3a4-a3+2a-1寰5a4+3a2-7a+2,姹傝繖涓椤瑰紡.(2x2-x-1)-(x2-x- )+3(x2-1 ),鍏朵腑x=1 .-9(x-2)-y(x-5)锛1锛鍖栫畝鏁翠釜寮忓瓙.锛2锛夊綋x=5鏃,姹倅鐨勮В.5(9+a)脳b-5(5+b)脳a 锛1锛夊寲绠鏁翠釜寮忓瓙.锛2锛夊綋a=5/7鏃,姹傚紡瀛愮殑鍊.62g+62(g+b)-b 锛1锛...
绛旓細X=1/2 (2)6-3锛圶+2/3锛=2/3 6-3X-2=2/3 -3X=-10/3 X=10/9 (3)2锛200-15X锛=70+25X 400-30X=70+25X -55X=-330 X=6 (4)3锛2X+1锛=12 6X+3=12 6X=9 X=3/2 (5)1/4X-1/2=3/4 (1/4)X=5/4 X=5 (6)7X-5/4 =3/8 7X=13/8 X=13/56 (7)2X...
