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  • 科目:数学
  • 题型:选择题
  • 难度:容易
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题文

已知,点C在内, ,若=2m+m),则=(    )                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         

A.1 B.2 C. D.4
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已知,,,点C在内,,若2mm(),则()A.1B.2C.D