题目内容
计算:
(1)cos245°+tan60°•sin60°-2tan45°sin30°;
(2)(sin45°-π)0-2|-cos60°|-
+(tan30°)-1.
(1)cos245°+tan60°•sin60°-2tan45°sin30°;
(2)(sin45°-π)0-2|-cos60°|-
| 12 |
(1)原式=(
)2+
×
-2×1×
=
+
-1
=2-1
=1;
(2)原式=1-2×
-2
+
=1-1-2
+
=-
.
| ||
| 2 |
| 3 |
| ||
| 2 |
| 1 |
| 2 |
=
| 1 |
| 2 |
| 3 |
| 2 |
=2-1
=1;
(2)原式=1-2×
| 1 |
| 2 |
| 3 |
| 3 |
=1-1-2
| 3 |
| 3 |
=-
| 3 |
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