计算或化简:(1)1x-1-xx2-1.(2)(1a+1+1a-1)÷1a+1+1.-数学

题目简介

计算或化简:(1)1x-1-xx2-1.(2)(1a+1+1a-1)÷1a+1+1.-数学

题目详情

计算或化简:
(1)
1
x-1
-
x
x2-1

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

答案

(1)原式=class="stub"x+1-x
x2-1

=class="stub"1
x2-1


(2)原式=class="stub"a-1+a+1
(a+1)(a-1)
•(a+1)+1
=class="stub"2a
a-1
+1
=class="stub"a+1
a-1

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