x(x+2)(x-2)-4x^2+8x

问题描述:

x(x+2)(x-2)-4x^2+8x

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
祝学习进步