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There have been 1 items by minxian (Search limited from 24-05-2020)
Posted by minxian on 02-05-2021 - 13:04 in Bất đẳng thức và cực trị
Cho x>0, y>0 cm:
\[\left( {x + y} \right)\left( {\frac{1}{x} + \frac{1}{y}} \right) > 4\]