计算:(1)y26x÷13x2;(2)a2-48a2b•12ab3a-6;(3)(1+1a-1)÷a21-a2;(4)2x2-4-12x-4.-数学

题目简介

计算:(1)y26x÷13x2;(2)a2-48a2b•12ab3a-6;(3)(1+1a-1)÷a21-a2;(4)2x2-4-12x-4.-数学

题目详情

计算:
(1)
y2
6x
÷
1
3x2

(2)
a2-4
8a2b
12ab
3a-6

(3)(1+
1
a-1
)÷
a2
1-a2

(4)
2
x2-4
-
1
2x-4
题型:解答题难度:中档来源:不详

答案

(1)原式=
y2
6x
•3x2
=
xy2
2


(2)原式=
(a+2)(a-2)
8a2b
class="stub"12ab
3(a-2)

=class="stub"a+2
2a


(3)原式=class="stub"a
a-1
(1+a)(1-a)
a2

=-class="stub"1+a
a


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

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

=-class="stub"1
2x+4

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