x(x+2)(x-2)-4x^2+8x
问题描述:
x(x+2)(x-2)-4x^2+8x
答
此题用到提取公因式
x(x+2)(x-2)-4x^2+8x
=x(x+2)(x-2)-4x(x-2)
=x(x-2)(x+2-4)
=x(x-2)(x-2)
=x(x-2)²
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