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Proof of Vietnam TST 2017

Bai 3 TST 2017
Bai 4 TST 2017

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sangaku-problem

bai-3-vmo-2017

Bai-7-VMO-2017

Extraversion of some geometry problems

doi-mo-hinh

tam-noi-tiep-dong-vien

Circumcircle of ex-tangent triangle

tam-giac-dieu-kien-dac-biet

bai-toan-hay-2