因式分解:(1)-x^2+2x-1(2)m^2-n^2+2m-2n有助于回答者给出准确的答案
问题描述:
因式分解:(1)-x^2+2x-1(2)m^2-n^2+2m-2n
有助于回答者给出准确的答案
答
1.-x^2+2x-1
=-(x^2-2x+1)
=-(x-1)^2
2.m^2-n^2+2m-2n
=(m+n)(m-n)+2(m-n)
=(m+n+2)(m-n)