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(1):x²;-6x+9=(x-3)²;x²;-4=(x+2)(x-2)當x=3時原式=(3-3)²;/(3+2)(3-2)=0(2):x²;-4x=x(x-4)x²;-8x+16=(x-4)²;當x=5時原式=5(5-4)/(5-4)²;=5
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