因式分解?
3x(x-4)^2-6x^2(4-x)
=3x(x-4)^2+6x^2(x-4)
=3x(x-4)(x-4+2x)
=3x(x-4)(3x-4)
计算3x(x-4)^2-6x^2(4-x)
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