> 数学 >
3−sin70°
2−cos210°
=______．
人气：497 ℃　时间：2020-03-24 18:29:16
解答
3−sin70°
2−cos210°
=
3−sin70°
2−
1+cos20°
2
=
2(3−sin70°)
3−cos 20°
=
2(3−cos20°)
3−cos 20°
=2
故答案为：2
推荐
猜你喜欢
© 2026 79432.Com All Rights Reserved.
电脑版|手机版