m^2-4mn+4n^2=0求(m+n)^2/mn
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m^2-4mn+4n^2=0求(m+n)^2/mnm^2-4mn+4n^2=0求(m+n)^2/mnm^2-4mn+4n^2=0求(m+n)^2/mnm^2-4mn+n^2=0即m^2+n^2=4mn
m^2-4mn+4n^2=0求(m+n)^2/mn
m^2-4mn+4n^2=0求(m+n)^2/mn
m^2-4mn+4n^2=0求(m+n)^2/mn
m^2-4mn+n^2=0
即
m^2+n^2=4mn
则
(m+n)^2/mn
=(m^2+n^2+2mn)/mn
=(4mn+2mn)/mn
=6mn/mn
=6
(m-2n)^2=0 m=2n
(m+n)^2)/mn=9n^2/2n^2=9/2
(1) 由方程解得: m=2n
(2) 故(m+n)^2=9n^2 ; mn=2n^2
(3) 原式=9/2
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