(1)计算:12+(14)-1-(2+1)0;(3)计算:2aa2-9-1a-3.-数学

题目简介

(1)计算:12+(14)-1-(2+1)0;(3)计算:2aa2-9-1a-3.-数学

题目详情

(1)计算:
12
+(
1
4
)-1-(
2
+1)0

(3)计算:
2a
a2-9
-
1
a-3
题型:解答题难度:中档来源:芜湖

答案

(1)原式=2
3
+4-1
=2
3
+3

(2)原式=class="stub"2a
(a+3)(a-3)
-class="stub"1
a-3

=class="stub"2a
(a+3)(a-3)
-class="stub"a+3
(a+3)(a-3)

=class="stub"a-3
(a+3)(a-3)

=class="stub"1
a+3

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