配套习题- 正弦定理的推导 -【青果学院】

1/4单选题

难度：

1.有关正弦定理的叙述：①正弦定理只适用于锐角三角形；②正弦定理不适用与钝角三角形；③在某一确定的三角形中，各边与它的对角的正弦的比是定值；④在△ABC中，

。
其中正确的个数是（）

A	1
B	2
C	3
D	4

正确答案：Qg==

6Kej5p6Q77ya5q2j5bym5a6a55CG6YCC55So5LqO5Lu75oSP5LiJ6KeS5b2i77yM5pWF4pGg4pGh5Z2H5LiN5q2j56Gu77yb5LiA5Liq5LiJ6KeS5b2i56Gu5a6a77yM5YiZ5a6D55qE5ZCE6L655LiO5a+56KeS55qE5q2j5bym5piv56Gu5a6a55qE77yM5omA5Lul5ZCE6L655LiO5a6D55qE5a+56KeS55qE5q2j5bym55qE5q+U5piv5a6a5YC877yM5pWF4pGi5q2j56Gu77yb5LukPGltZyB3aWR0aD01NTQgaGVpZ2h0PTYyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvOTAvMDAvckJBQ0ZGU2pUWWlpQlloakFBQUlQM0N3d3VnMTE5LnBuZyI+77yM4pGj5q2j56Gu44CC5pWF6YCJQg==

2/4单选题

难度：

2.在△ABC中，

（）

A	1
B	0
C
D	π

正确答案：Qg==

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

3/4单选题

难度：

3.在△ABC中，a=3，b=5，sinA=

，则sinB=（）

A
B	1
C
D

正确答案：RA==

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

4/4单选题

难度：

4.在△ABC中，若

，则∠B等于（）

A	30°
B	45°
C	60°
D	90°

正确答案：Qg==

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