化简:(1)(-ab)2÷(2a25b)2•a5b(2)(x+2x2-2x-x-1x2-4x+4)÷x-4x.-数学

题目简介

化简:(1)(-ab)2÷(2a25b)2•a5b(2)(x+2x2-2x-x-1x2-4x+4)÷x-4x.-数学

题目详情

化简:
(1)(
-a
b
)2÷(
2a2
5b
)2
a
5b

(2)(
x+2
x2-2x
-
x-1
x2-4x+4
x-4
x
题型:解答题难度:中档来源:不详

答案

(1)原式=
a2
b2
25b2
4a4
class="stub"a
5b

=class="stub"5
4ab


(2)原式=[class="stub"x+2
x(x-2)
-class="stub"x-1
(x-2)2
]•class="stub"x
x-4

=[
(x+2)(x-2)
x(x-2)2
-
x(x-1)
x(x-2)2
]•class="stub"x
x-4

=class="stub"x-4
x(x-2)2
class="stub"x
x-4

=class="stub"1
x2-4x+4

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