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题目
(x²y³+xy)(x²y³-xy)÷x²y³,其中x=3,y=2

提问时间:2020-10-20

答案
(x²y³+xy)(x²y³-xy)÷x²y³
=(x^4y^6-x²y²)÷x²y³
=x²y³-1/y
带入 x=3 y=2得
=9×8-1/2
=71.5
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