若m-n=7,m^2-n^2=14,则m+n=
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若m-n=7,m^2-n^2=14,则m+n=若m-n=7,m^2-n^2=14,则m+n=若m-n=7,m^2-n^2=14,则m+n=m^2-n^2=14所以:(m+n)(m-n)=14所以:m+
若m-n=7,m^2-n^2=14,则m+n=
若m-n=7,m^2-n^2=14,则m+n=
若m-n=7,m^2-n^2=14,则m+n=
m^2-n^2=14
所以:
(m+n)(m-n)=14
所以:
m+n=14÷(m-n)
所以:
m+n=14÷7=2
(m-n)(m n)=14 m-n=2
m²-n²=(m+n)(m-n)=14 (m+n)*7=14 m+n=2
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