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已知:$a,b,c>0.a+b+c\geqslant \dfrac{3}{2}$,证明或否定:$\dfrac{a}{a+bc}+\dfrac{b}{b+ca}+\dfrac{c}{c+ab}\geqslant \dfrac{9}{3+a+b+c}$ facebooker 发表于 2019-12-13 22:52
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