已知m+n=o.75m-n=o.25利用因式分解求m^2-2mn+3m+3n+n^2的值_数学解答

已知m+n=o.75m-n=o.25利用因式分解求m^2-2mn+3m+3n+n^2的值

人气：126 ℃　时间：2019-10-10 04:04:33

解答

m^2-2mn+3m+3n+n^2
=m²-2mn+n²+3m+3n
=(m-n)²+3(m+n)
=0.25²+3×0.75
=0.0625+2.25
= 2.3125