计算:(1)(12a-1b-3)÷(-58a-2b-4)(2)[m-nm2-2mn+n2-mn+n2m2-n2]•mnn-1.-数学

题目简介

计算:(1)(12a-1b-3)÷(-58a-2b-4)(2)[m-nm2-2mn+n2-mn+n2m2-n2]•mnn-1.-数学

题目详情

计算:
(1)(
1
2
a-1b-3)÷(-
5
8
a-2b-4)
       
(2)[
m-n
m2-2mn+n2
-
mn+n2
m2-n2
]•
mn
n-1
题型:解答题难度:中档来源:不详

答案

(1)原式=-class="stub"4
5
ab;

(2)原式=[class="stub"m-n
(m-n)2
-
n(m+n)
(m+n)(m-n)
]•class="stub"mn
n-1

=class="stub"1-n
m-n
class="stub"mn
n-1

=-class="stub"mn
m-n

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