a,b∈R+ 1/(1+a)+1/(1+b)+1/(1+c)=1求证a+b+c≥6
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a,b∈R+ 1/(1+a)+1/(1+b)+1/(1+c)=1求证a+b+c≥6
a,b∈R+ 1/(1+a)+1/(1+b)+1/(1+c)=1求证a+b+c≥6
a,b∈R+ 1/(1+a)+1/(1+b)+1/(1+c)=1求证a+b+c≥6
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