配套习题- 正弦定理解三角形 -【青果学院】

1/3单选题

难度：

1.已知△ABC的角A，B，C所对的边分别为a，b，c，若A=30°，B=120°，b=12，则a=（）

A
B
C
D

正确答案：Qw==

6Kej77ya55SxQT0zMMKw77yMQj0xMjDCsO+8jGI9MTI8YnI+5qC55o2u5q2j5bym5a6a55CGPGltZyB3aWR0aD05MCBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC9BRS84NC9yQkFDRkZOSGtUREJjalVsQUFBREdScV80N3M0NDUucG5nIj7lvpfvvJo8aW1nIHdpZHRoPTE3MiBoZWlnaHQ9ODQgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC9BRS84NC9yQkFDRkZOSGtUVGlnOFI1QUFBRnYxMkJlR3cwNDUucG5nIj4g

2/3单选题

难度：

2.已知△ABC的三个内角之比为A：B：C=3：2：1，那么对应三边之比a：b：c等于：（）

A	3:2:1
B	:2:1
C	::1
D	:1

正确答案：RA==

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

3/3单选题

难度：

3.在△ABC中，已知b=2，B=45°，如果用正弦定理解三角形有两解，则边长a的取值范围是（　　）

A
B
C
D

正确答案：QQ==

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