题目内容
(1)计算:
-
-(
+1)0.
(2)|-
|+sin30°+2cos245°-
tan260°.
| 2 | ||
|
| 8 |
| 2 |
(2)|-
| 1 |
| 2 |
| 1 |
| 3 |
(1)原式=
-2
-1,
=2
+2-2
-1,
=1;
(2)原式=
+
+2×(
)2-
×(
)2,
=
+
+1-1,
=1.
2(
| ||
| 2-1 |
| 2 |
=2
| 2 |
| 2 |
=1;
(2)原式=
| 1 |
| 2 |
| 1 |
| 2 |
| ||
| 2 |
| 1 |
| 3 |
| 3 |
=
| 1 |
| 2 |
| 1 |
| 2 |
=1.
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