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There have been 2 items by zack william (Search limited from 06-06-2020)
Posted by zack william on 06-06-2018 - 19:28 in Bất đẳng thức và cực trị
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Posted by zack william on 29-05-2018 - 22:26 in Tài liệu - Đề thi
$\frac{a}{2-a}+\frac{1-a}{1+a}=\frac{a}{2-a}+1+\frac{1-a}{1+a}+1-2 =\frac{2}{2-a}+\frac{2}{1+a}-2 \geq \frac{8}{2+a+1-a}-2=\frac{2}{3}$
min T=2/3 khi a=0,5