计算:(1)(x2x+2-4x+2)÷x-2x(2)x-1x+2÷x2-2x+1x2-4+1x-1.-数学

题目简介

计算:(1)(x2x+2-4x+2)÷x-2x(2)x-1x+2÷x2-2x+1x2-4+1x-1.-数学

题目详情

计算:
(1)(
x2
x+2
-
4
x+2
x-2
x

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

答案

(1)原式=
x2-4
x+2
class="stub"x
x-2

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

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

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

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

=1.


(2)原式=class="stub"x-1
x+2
x2-4
x2-2x+1
+class="stub"1
x-1
=class="stub"x-1
x+2
(x+2)(x-2)
(x-1)2
+class="stub"1
x-1
=class="stub"x-2
x-1
+class="stub"1
x-1
=class="stub"x-2+1
x-1
=class="stub"x-1
x-1
=1.

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