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(1)(﹣1)2019+(sin30°)﹣1+()0﹣|3﹣|+82019×(﹣0.125)2019 (2)解+1=
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sin30°+cos30°sin30°-cos30°+﹣12016÷2
下列各式中正确的是
sin20
0
+sin30
0
=sin50
0
;
sin60
0
=2sin30
0
;
tan20
0
﹒tan70
0
=1;
cos30
0
<cos60
0
;
计算sin300一23×0.125+20040+|-1|
sin45sin30°+cos60°+tan45°=
计算2cos45°﹣tan40°+10++sin30°﹣1.
Sin30°=
0.5
3
2
1
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+π0﹣2|1﹣sin30°|+﹣1.
计算﹣12015+sin30°﹣π﹣3.140+﹣1.
计算|3﹣5|﹣π﹣3.140+﹣2﹣1+sin30°
计算sin30°+2018﹣0﹣2﹣1+|﹣4|
sin30°=
0
1
计算﹣π﹣40﹣sin30°.
计算﹣+10﹣+|﹣5|﹣sin30°﹣1.
计算2-4×sin30º+-23
下列各数sin300-其中无理数的个数是
1个
2个
3 个
4个
计算|﹣|+﹣sin30°+π+30.
计算题如图所示已知三角形ABC中∠A=30°∠B=120°b=12求边长ac和∠Csin120°=3
sin30°=
1/2
1.414
1.732
1
计算﹣12014+sin30°﹣1+0﹣|3﹣|+83×﹣0.1253.
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