m（x-y)²-x+y=m(x-y)²-(x-y)=(x-y)(mx-my-1)5(y-x)²+3（x-y) =5(x-y)²+3(x-y)=(x-y)(5x-5y+3) 15*（a-b)²-3y(b-a)=15(a-b)²+3y(a-b)=3(a-b)(5a-5b+y)6(m-n)³-12（n-m)²...