题目内容
(1)计算:(
)-1-
×2cos45°-(2010+π)0+|-3+
|;
(2)化简
÷(a-
).
1 |
2 |
8 |
3 |
(2)化简
a2-1 |
a |
2a-1 |
a |
(1)原式=2-2
×2×
-1+3-
=-
;
(2)原式=
÷
=
•
=
.
2 |
| ||
2 |
3 |
3 |
(2)原式=
(a+1)(a-1) |
a |
a2-2a+1 |
a |
(a+1)(a-1) |
a |
a |
(a-1)2 |
a+1 |
a-1 |
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