去括号并合并同类项并化简
1.(4x-3y)-[-(3y-x)+(x+y)]-5x2.4xy²-3x²y-{3x²y+xy²-[2xy²-4x...
1. (4x-3y)-[-(3y-x)+(x+y)]-5x
2. 4xy²-3x²y-{3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)]}
3. (3*a的三次方-2a²+5a+7)+(-2a²-½a+3)-(-4*a的三次方+½a²+6a-5)
4. 5x²-[-4x²+2(x²-三分之二x)] x=-3(并求值)
5. a²-5a²b+3ab²-3*b的三次方+2*b的三次方-3ab²-5a²b-2*a的三次方 a=-1 b=2(并求值) 展开
2. 4xy²-3x²y-{3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)]}
3. (3*a的三次方-2a²+5a+7)+(-2a²-½a+3)-(-4*a的三次方+½a²+6a-5)
4. 5x²-[-4x²+2(x²-三分之二x)] x=-3(并求值)
5. a²-5a²b+3ab²-3*b的三次方+2*b的三次方-3ab²-5a²b-2*a的三次方 a=-1 b=2(并求值) 展开
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