计算:(1)(-1x)÷1x2+x(2)aa-1÷a2-aa2-1-1a-1.-数学

题目简介

计算:(1)(-1x)÷1x2+x(2)aa-1÷a2-aa2-1-1a-1.-数学

题目详情

计算:
(1)(-
1
x
1
x2+x
       
(2)
a
a-1
÷
a2-a
a2-1
-
1
a-1
题型:解答题难度:中档来源:不详

答案

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

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

=class="stub"a+1
a-1
-class="stub"1
a-1

=class="stub"a
a-1

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