题目内容
计算与化简:
(1)
+
cos60°+sin45°-(
tan30°)0;
(2)(
+
)÷
+1.
(1)
|
| 2 |
| ||
| 2 |
(2)(
| 1 |
| a+1 |
| 1 |
| a-1 |
| a |
| a+1 |
(1)原式=
+
×
+
-1
=
-1;
(2)原式=
×
+1
=
+1
=
.
| ||
| 2 |
| 2 |
| 1 |
| 2 |
| ||
| 2 |
=
| 3 |
| 2 |
| 2 |
(2)原式=
| 2a |
| (a+1)(a-1) |
| a+1 |
| a |
=
| 2 |
| a-1 |
=
| a+1 |
| a-1 |
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