把括号去掉然后算最后得0 =-3x²y-10x³+3x³+6x³y+3x²y-6x³y+7x³ =-3x²y+3x²y+3x³+7x³-10x³+6x³y-6x³y =0
试说明代数式/-(3x²y+10x³)+3x³+6x³y+3x²y-(6x³y-7x³)的值与x,y都无关
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