ax^2-axy+bx^2+cxy-cx^2-bxy
=(ax^2-axy)+(bx^2-bxy)-(cx^2-cxy)
=ax(x-y)+bx(x-y)-cx(x-y)
=x(x-y)(a+b-c)
因式分解ax^2-axy+bx^2+cxy-cx^2-bxy
ax^2-axy+bx^2+cxy-cx^2-bxy
=(ax^2-axy)+(bx^2-bxy)-(cx^2-cxy)
=ax(x-y)+bx(x-y)-cx(x-y)
=x(x-y)(a+b-c)