计算:(1)(3x2y)3•(-5y);(2)[(x+y)2-y(2x+y)-4x]÷2x.-数学

题目简介

计算:(1)(3x2y)3•(-5y);(2)[(x+y)2-y(2x+y)-4x]÷2x.-数学

题目详情

计算:
(1)(3x2y)3•(-5y);
(2)[(x+y)2-y(2x+y)-4x]÷2x.
题型:解答题难度:中档来源:不详

答案

(1)原式=27x6y3•(-5y)=-135x6y4;
(2)原式=(x2+y2+2xy-2xy-y2-4x)÷2x
=(x2-4x)÷2x
=class="stub"1
2
x-2.

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