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題目有問題,3前面應該是-號吧,不然沒法做. 4x²;+4x-3=y²;+4y 4x²;+4x+1-y²;-4y-4=0 (2x+1)²;-(y+2)²;=0 平方項恒非負,兩平方項之和=0,兩平方項都=0 2x+1=0 x=-1/2 y+2=0 y=-2 x-y=-(1/2)-(-2)=3/2 如果題目是這樣的,那麼題目肯定錯了,3前面應該是-號.
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