m+n=1,mn=1/2,求1/4m²-1/2mn+1/4n²
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m+n=1,mn=1/2,求1/4m²-1/2mn+1/4n²
m+n=1,mn=1/2,求1/4m²-1/2mn+1/4n²
m+n=1,mn=1/2,求1/4m²-1/2mn+1/4n²
1/4m²-1/2mn+1/4n²
=(1/2m-1/2n)2
=1/4(m-n)2
=1/4[(m+n)2-4mn]
=1/4(1-2)
=-1/4
(m+n)2=1 4mn=2 (m-n)2=-1?不对吧,你抄错题了?