Written by punjalak
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Friday, 11 August 2017 13:54 |
About Khan Academy: Khan Academy is a nonprofit with a mission to provide a free, world-class education for anyone, anywhere. We believe learners of all ages should have unlimited access to free educational.
ที่มา : https://www.youtube.com/channel/UC4a-Gbdw7vOaccHmFo40b9g อัพโหลดโดย Khan Academy
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