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
2个回答
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
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