题目内容
计算 (1)2cos230°+4sin60°•cos45°-tan30°
(2)2cos30°+tan45°-tan60°+(
-1)0.
(2)2cos30°+tan45°-tan60°+(
| 2 |
(1)原式=2×(
)2+4×
×
-
=
+
-
.
(2)原式=2×
+1-
+1=2.
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| 2 |
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| 2 |
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| 2 |
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| 3 |
=
| 3 |
| 2 |
| 6 |
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| 3 |
(2)原式=2×
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| 2 |
| 3 |
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