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如图,分别延长△ABC的三边BA、CB、AC,则∠α+∠β+∠γ=( ) A.1...
如图,分别延长△ABC的三边BA、CB、AC,则∠α+∠β+∠γ=( )
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A.180°
B.270°
C.360°
D.不能确定
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