snowangel1103
New member
- Xu
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1/ cho a,b,c>0 và a+b+c=1
cm: \[(\frac{1}{a}-1)(\frac{1}{b}-1)(\frac{1}{c}-1)\geq8\]
2/ cm:\[a+\frac{1}{b(a-b)}\geq3 \forall a>b>0\]
3/ cm: \[a+\frac{4}{(a-b)(b+1)^2}\geq3 \forall a>b>0\]
4/ cm: \[\frac{2a^3+1}{4b(a-b}\geq3\]
\[\forall a\geq\frac{1}{2} , \forall\frac{a}{b}>1\]
cm: \[(\frac{1}{a}-1)(\frac{1}{b}-1)(\frac{1}{c}-1)\geq8\]
2/ cm:\[a+\frac{1}{b(a-b)}\geq3 \forall a>b>0\]
3/ cm: \[a+\frac{4}{(a-b)(b+1)^2}\geq3 \forall a>b>0\]
4/ cm: \[\frac{2a^3+1}{4b(a-b}\geq3\]
\[\forall a\geq\frac{1}{2} , \forall\frac{a}{b}>1\]