1/x²×x³+x的7次方÷x² 2/、【（x-y - 知识问答

1/x²×x³+x的7次方÷x² 2/、【（x-y)²+（x+y)(x-y)]÷

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1个回答

x^2*x^3+x^7÷x²
=x^5+x^5
=2x^5
、【（x-y)²+（x+y)(x-y)]÷2x
=(x-y)(x-y+x+y)÷2x
=(x-y)*2x÷2x
=x-y

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