(1)计算:12+|3-2|+2-1-sin30°.(2)化简:a-2a2-1÷(1a-1-1).-数学

题目简介

(1)计算:12+|3-2|+2-1-sin30°.(2)化简:a-2a2-1÷(1a-1-1).-数学

题目详情

(1)计算:
12
+|
3
-2
|+2-1-sin30°.    
(2)化简:
a-2
a2-1
÷(
1
a-1
-1).
题型:解答题难度:中档来源:泰州一模

答案

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

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

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

=-class="stub"1
a+1

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