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你可以把A和B畫在坐標系上,然後C是直線Y=2上面的任意一點 你會很容易知道,只要A、B、C三點不共線,就能够組成三角形 AB的方程,y=-3x+5,與直線y=2的交點為(1,2),故只要X不等於1就行 望採納
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