因式分解:(m-n)²+2（n-m）=_______ 因式分解：x²-y²+6y-9=______
因式分解:(m-n)²+2（n-m）=_______ 因式分解：x²-y²+6y-9=______
数学人气：981 ℃时间：2019-10-23 08:40:21
优质解答
(m-n)²+2（n-m）=_______= (m-n)² -2 (m-n)= (m-n-2) (m-n)x²-y²+6y-9=______= x²-(y²-6y+9)= x²- (y-3)²= (x+y-3) (x-y+3)
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