3x6^2+6xy-4x-8

问题描述:

3x6^2+6xy-4x-8
再加一道题:
x^2+3y-xy-3x

应该是3x²y+6xy-4x-8
3x²y+6xy-4x-8=3xy(x+2)-4(x+2)=(3xy-4)(x+2)
x^2+3y-xy-3x=x(x-3)-y(x-3)=(x-3)(x-y)