(1)计算:|-3|-(12)-1+(π-3)0-2cos60°;(2)先化简,再求值:(aa-1-2a-1a-1)÷a-1a+2,其中a=-3.-数学

题目简介

(1)计算:|-3|-(12)-1+(π-3)0-2cos60°;(2)先化简,再求值:(aa-1-2a-1a-1)÷a-1a+2,其中a=-3.-数学

题目详情

(1)计算:|-3|-(
1
2
-1+(π-
3
0-2cos60°;
(2)先化简,再求值:(
a
a-1
-
2a-1
a-1
a-1
a+2
,其中a=-3.
题型:解答题难度:中档来源:淮安

答案

(1)原式=3-2+1-1=1;

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

当a=3时,原式=-class="stub"-3+2
-3-1
=-class="stub"1
4

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