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计算：2cos30°﹣|﹣1|+（）﹣1．
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计算|﹣3|+2cos30°+0﹣﹣1.
计算3﹣+﹣1﹣2012﹣π0+2cos30°.
2cos30°﹣|1﹣tan60°|+tan45°•sin45°.
2cos30°的值等于
1
2
计算π0+2cos30°﹣|2﹣|﹣﹣2
先化简再求值其中a=2tan60°b=2cos30°
计算﹣1.4140+﹣1﹣+2cos30°.
2cos30°=.
计算﹣12﹣2cos30°++﹣20140.
计算﹣20＋﹣1﹣2cos30°－|﹣2|
－－4－1+－2cos30°=_______
计算﹣2cos30°+﹣﹣3﹣1
计算|1－|＋－2cos30°＋π－30.
计算﹣2﹣1+﹣π0﹣|﹣2|﹣2cos30°
计算2cos30°+tan30°·cos60°-
下列各式中正确的是
sin30
0
+cos60
0
=1
sinA=
=30
0
cos60
0
=cos(2×30
0
)=2cos30
0
tan60
0
+cot45
0
=2
计算﹣1+sin60°﹣10﹣2cos30°+|﹣1|
计算+﹣20140﹣2cos30°﹣﹣1.
计算tan60°+2sin45°-2cos30°的结果是___________.
计算cos30°•tan30°+2cos30°．
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2
=300 cos600=cos(2×300 )=2cos300 tan600+cot450=2
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