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如果他們有交點,那麼交點的橫縱坐標相等 那麼2x^2+1=-2x^2+k 整理得4x^2+1-k=0 所以當判別式>0時,有兩個不等實數根,即兩個交點橫坐標 當判別式=0時,有兩個相等實數根,即一個交點橫坐標 當判別式
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