m^2-4mn+4n^2=0求(m+n)^2/mn
3个回答
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
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