若m2-4mn+4n2=0,求m+n/m-n

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若m2-4mn+4n2=0,求m+n/m-n若m2-4mn+4n2=0,求m+n/m-n若m2-4mn+4n2=0,求m+n/m-nm^2-4mn+4n^2=0==>(m-2n)^2=0==>m=2n

若m2-4mn+4n2=0,求m+n/m-n
若m2-4mn+4n2=0,求m+n/m-n

若m2-4mn+4n2=0,求m+n/m-n
m^2-4mn+4n^2=0
==>(m-2n)^2=0
==>m=2n
m+n/m-n
=2n+n/2n-n
=3n/n
=3

m^2-4mn+4n^2=0
==>(m-2n)^2=0
==>m=2n
m+n/m-n
=2n+n/2n-n
=3n/n
=3

m2-4mn+4n2=(m-2n)^2=0
m=2n
m+n/m-n=2n+n/2n-n=3

m2-4mn+4n2=0
(m-2n)^2=0
m=2n
m+n/m-n=(2n+n)/(2n-n)=3

不懂 .