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方程是二元一次的話,那麼x,y的次數最大只能是1次,換句話說就是如果次數不是一次的,就不應該存在 所以x^2項前面的係數應該就是0 所以m=2或-2 但是因為m=-2時,3y=7,變成一元一次方程,所以不符合條件. 所以最終m=2
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