Скачать или смотреть GMAT: Math 38 | Problem solving | GMAT | Khan Academy

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190-194, pg. 178. Created by Sal Khan.

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GMAT on Khan Academy: Sal works through the 249 problem solving questions in chapter 5 of the the 11th edition of the official GMAC GMAT Review (ISBN Number: 0-9765709-0-4 published in 2005)

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