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(2012•泰州模拟)计算或化简:(1)计算:2cos30°+|3−2|−(−5)0;(2)化简:(1−1a−1)÷a2−4a+4a2−a.

题目详情
(2012•泰州模拟)计算或化简:
(1)计算:2cos30°+|
3
−2|−(−5)0;
(2)化简:(1−
1
a−1
a2−4a+4
a2−a
▼优质解答
答案和解析
(1)原式=2×
3
2
+2-
3
-1
=
3
+2-
3
-1
=1;
(2)原式=
a−1−1
a−1
×
a(a−1)
(a−2)2

=
a−2
a−1
×
a(a−1)
(a−2)2

=
a
a−2