>
数学
>
若
tanα=
1
2
,则
sinα+cosα
2sinα−3cosα
=______.
人气:456 ℃ 时间:2020-05-12 06:10:17
解答
sinα+cosα
2sinα−3cosα
=
tanα+1
2tanα−3
=
1
2
+1
2×
1
2
−3
=−
3
4
.
故答案为:
−
3
4
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