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qwerty98 hasn't added any friends yet.
19-01-2014 - 13:29
cho a,b,c>0,abc=1tìm max:
$\frac{ab}{a+b+ab}+\frac{bc}{b+c+bc}+\frac{ca}{c+a+ac}$
bài 2:
cho a,b,c>0 a+b+c+abc=4
cmr: $a+b+c\geq ab+bc+ca$