已知a,b,c属于R+,求证(b+c)/a+(c+a)/b+(a+b)/c>=6RT
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已知a,b,c属于R+,求证(b+c)/a+(c+a)/b+(a+b)/c>=6RT
已知a,b,c属于R+,求证(b+c)/a+(c+a)/b+(a+b)/c>=6
RT
已知a,b,c属于R+,求证(b+c)/a+(c+a)/b+(a+b)/c>=6RT
a/b+b/a >= 2*√(a/b)*(b/a) = 2
(b+c)/a+(c+a)/b+(a+b)/c
= (b/a+a/b)+(a/c+c/a)+(b/c+c/b)
>= 6