(1)计算:(2-1)0+(3-1)(2)计算:aa-1-a+1a2-1.-数学

题目简介

(1)计算:(2-1)0+(3-1)(2)计算:aa-1-a+1a2-1.-数学

题目详情

(1)计算:(
2
-1)0+(
3
-1)

(2)计算:
a
a-1
-
a+1
a2-1
题型:解答题难度:中档来源:德宏州

答案

(1)原式=1+
3
-1
=
3


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

=
(a+1)(a-1)
(a+1)(a-1)

=1.

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