本课配套习题挑战模式1/3
单选题
难度系数:
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: |
一次做对,真牛!
+5奖励规则>
- 提示1:IOeUsUHlkoxC55qE5bqm5pWw5rGC5Ye6c2luQeS4jnNpbkLnmoTlgLw=
- 提示2:IOeUsWLnmoTlgLzvvIzmoLnmja7mraPlvKblrprnkIbljbPlj6/msYLlh7ph55qE5YC8
- 答案:Qw==
6Kej77ya55SxQT0zMMKw77yMQj0xMjDCsO+8jGI9MTI8YnI+5qC55o2u5q2j5bym5a6a55CGPGltZyB3aWR0aD05MCBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC9BRS84NC9yQkFDRkZOSGtUREJjalVsQUFBREdScV80N3M0NDUucG5nIj7lvpfvvJo8aW1nIHdpZHRoPTE3MiBoZWlnaHQ9ODQgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC9BRS84NC9yQkFDRkZOSGtUVGlnOFI1QUFBRnYxMkJlR3cwNDUucG5nIj4g
本课配套习题挑战模式2/3
单选题
难度系数:
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 |
一次做对,真牛!
+5奖励规则>
- 提示1:IEErQitDPc+A
- 提示2:IOeUseato+W8puWumueQhuWPr+W+l+S4iei+ueS5i+avlGHvvJpi77yaYz1zaW5B77yac2luQu+8mnNpbkM=
- 答案:RA==
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
本课配套习题挑战模式3/3
单选题
难度系数:
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: |
一次做对,真牛!
+5奖励规则>
- 提示1:IOWIqeeUqOato+W8puWumueQhuWSjGLlkoxzaW5C5rGC5b6XYeWSjHNpbkHnmoTlhbPns7vvvIzliKnnlKhC5rGC5b6XQStD
- 提示2:IOimgeS9v+S4ieinkuW9ouS4pOS4qui/meS4pOS4quWAvOS6kuihpeWFiOeci+iLpUHiiaQ0NcKw77yM5YiZ5ZKMQeS6kuihpeeahOinkuWkp+S6jjEzNcKw6L+b6ICM5o6o5pat5Ye6QStC77yeMTgwwrDkuI7kuInop5LlvaLlhoXop5Llkoznn5vnm74=
- 提示3:IOi/m+iAjOWPr+aOqOaWreWHujQ1wrDvvJxB77ycMTM1wrDoi6VBPTkw77yM6L+Z5qC36KGl6KeS5Lmf5pivOTDCsO+8jOS4gOino+S4jeespuWQiOmimOaEj+i/m+iAjOWPr+aOqOaWreWHunNpbkHnmoTojIPlm7TvvIzliKnnlKhzaW5B5ZKMYeeahOWFs+ezu+axguW+l2HnmoTojIPlm7Qu
- 答案:QQ==
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