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5 tháng 9 2016
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5 tháng 9 2016
Ta có
(m+n+p)^q >= m^q+n^q+p^q
=>a+b+c=1
=>(a+b+c)^2016=1 >= a2016 + b2016 + c2016
Mà a2016 + b2016 + c2016 >=0
=> a2016 + b2016 + c2016=1
F
1 tháng 7 2017
a2+b2+c2=ab+bc+ca
<=>2a2+2b2+2c2=2ab+2bc+2ca
<=>(a2-2ab+b2)+(b2-2bc+c2)+(c2-2ca+a2)=0
<=>(a-b)2+(b-c)2+(c-a)2=0
<=>a=b=c
mà a+b+c=3<=>a=b=c=1
=>P=0