3x6^2+6xy-4x-8再加一道题:x^2+3y-xy-3x
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3x6^2+6xy-4x-8再加一道题:x^2+3y-xy-3x3x6^2+6xy-4x-8再加一道题:x^2+3y-xy-3x3x6^2+6xy-4x-8再加一道题:x^2+3y-xy-3x应该是3
3x6^2+6xy-4x-8再加一道题:x^2+3y-xy-3x
3x6^2+6xy-4x-8
再加一道题:
x^2+3y-xy-3x
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)
第二道题:
x^2+3y-xy-3x
=(x^2-xy)+(3y-3x)
= x(x-y)+3(y-x)
= x(x-y)-3(x-y)
=(x-3)(x-y)