计算:(1)(-13a3b2)2(-2ab2)3÷(19a4b4)3;(2)[(x+y)2-(x+y)(x-y)]÷2y.-数学

题目简介

计算:(1)(-13a3b2)2(-2ab2)3÷(19a4b4)3;(2)[(x+y)2-(x+y)(x-y)]÷2y.-数学

题目详情

计算:
(1)(-
1
3
a3b2)2(-2ab2)3÷(
1
9
a4b4)3

(2)[(x+y)2-(x+y)(x-y)]÷2y.
题型:解答题难度:中档来源:不详

答案

(1)原式=class="stub"1
9
a6b4•(-8a3b6)÷(class="stub"1
729
a12b12)
=-class="stub"8
9
a9b10÷(class="stub"1
729
a12b12)
=-72ab2;

(2)原式=[(x+y)(x+y-x+y)]÷2y
=2y(x+y)÷2y
=x+y.

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