Question

(m-2n)平方-2(m-2n)+1-（m+1）平方因式分解·······

Answer 1

(m-2n)平方-2(m-2n)+1-（m+1）平方
=（m-2n-1）²-(m+1)²
=(m-2n-1+m+1)(m-2n-1-m-1)
=(2m-2n)(-2n-2)
=-4(m-n)(n+1)

Answer 2

（m-2n）^2-2(m-2n)+1-(m+1)^2
=(m-2n-1)^2-(m+1)^2
=(m-2n-1-m-1)(m-2n-1+m+1)
=-4(n+1)(m-n)