robin997's Content
There have been 2 items by robin997 (Search limited from 29-05-2020)
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$(a_1+a_2+a_3)^2 \geq (b_1+b_2+b_3)^2$in Bất đẳng thức và cực trịStarted by robin997, 16-06-2022 |
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$f(f(x))=x$in Phương trình hàmStarted by robin997, 03-10-2012 |
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