数学七年级上册（去括号）题目 七年级数学去括号的试题要有答案的
\u4e03\u5e74\u7ea7\u4e0a\u5b66\u671f\u6570\u5b66\u9898\uff1a\u5173\u4e8e\u53bb\u62ec\u53f7\u7684\uff082x³-2x²-2xy²\uff09-(x³-2xy²+y³)+(-x³+3x²y-y³)
=2x³-2x²-2xy²-x³+2xy²-y³-x³+3x²y-y³
=3x²y-2x²
=x²(3y-2)
\u8fd9\u4e48\u56de\u7b54\u6bd4\u8f83\u7cbe\u786e\uff1a
\u56e0\u539f\u5f0f\u53ef\u4ee5\u5316\u7b80\u4e3ax²(3y-2)\uff1b\u5176\u4e2dx\u9879\u662f\u5076\u6b21\u5e42\uff0c\u6240\u4ee5\u65e0\u8bbax\u7684\u6570\u503c\u65f6\u6b63\u503c\u8fd8\u662f\u8d1f\u503c\uff0c\u5176\u7ed3\u679c\u76f8\u540c\u3002
\u53bb\u62ec\u53f7\u524d\u9762\u662f\u52a0\u53f7\u7684\uff0c\u6253\u5f00\u62ec\u53f7\uff0c\u7b26\u53f7\u4e0d\u53d8\u3002\u5982\u679c\u662f\u51cf\u53f7\uff0c\u8981\u53d8\u53f7\u3002
8x-(-3x-5)
=8x+3x+5=11x+5
(3x-1)+(2-5x)
=3x-1+2-5x=1-2x
(-4y+3)-(-5y-2)=-4y+3+5y+2=y+5
3x+1-2(4-x)=3x+1-8+2x=5x-7
\u5f0f\u5b50-{-[a-(b-c)]}\u53bb\u62ec\u53f7\u5e94\u4e3a
A
a+b+c
B
a-b+c
C
-a+b-c
D.
a-b-c
\u7b54\u6848:B
m\u3001n\u4e92\u4e3a\u76f8\u53cd\u6570\uff0c\u5219(3m-2n)-(2m-3n)=?
\u7b54\u6848:\u539f\u5f0f=m+n=0
=3a²-1
第二题：原式=4b-6a-6a+9b
=13b-12a
第三题：原式=14abc-28a+18a-6abc
=8abc-10a
第四题：原式=5ab-[2a²b-(3ab-4ab²+a²b)
=5ab-(2a²b-3ab+4ab²-a²b
=5ab-2a²b+3ab-4ab²+a²b
=8ab-a²b-4ab²
第五题：原式=2a²-[-3a-(4a²-3a²+a+a-a²)]
=2a²-(-3a-a-a)
=2a²+5a
第六题：不知道题目是不是4a²-[a²+（4a²-2a)-2(a²-3a)]呢？是的话就是这样解的
原式=4a²-(a²+4a²-2a-2a²+6a)
=4a²-3a²-4a
=a²-4a
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去括号 问题要先从最里面的做起 一步步来就行了
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2ab-a2-4ab2
2a2-5a
a2-4a
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