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下列计算中正确的序号是 . ①2﹣=2;②sin30°=;③|﹣2|=2.
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计算sin30°+cos30°•tan60°.
sin30°+cos30°sin30°-cos30°+﹣12016÷2
下列各式中正确的是
sin20
0
+sin30
0
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0
;
sin60
0
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0
;
tan20
0
﹒tan70
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计算sin300一23×0.125+20040+|-1|
下列计算中正确的序号是_______. ① 2 5 - 5 = 2 ② sin 30
计算sin30°·tan45°=
计算sin30°﹣=.
计算|1﹣tan60°|﹣﹣sin30°﹣2+tan45°=.
计算sin30°+3tan60°﹣cos245°.
计算cos60°―sin245°+tan230°+cos230°一sin30°
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Sin30°=
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计算2cos230°﹣sin30°+.
下列结论中正确的有①sin30°+sin30°=sin60°②sin45°=cos45°③cos25
为锐角,且sinA.=cos28°,则∠A.=62°. A.1个
2个
3个
4个
计算|3﹣5|﹣π﹣3.140+﹣2﹣1+sin30°
下列计算中正确的序号是. ①2﹣=2②sin30°=③|﹣2|=2.
计算2-4×sin30º+-23
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下列计算中正确的序号是.①2﹣=2②sin30°=③|﹣2|=2.
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