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(x²;-2x)²;-9=0 (x²;-2x+3)(x²;-2x-3)=0 x²;-2x-3=0 (x-3)(x+1)=0 x1=3,x2=-1 函數y=(x²;-2x)²;-9的影像與x軸的交點的個數是2
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