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24 янв. 2011 г.
Sal is amazing. I use it all the time!
26 окт. 2010 г.
This is a great site, I became an honors student in my algebra 2 class along with 1 other kid and I had 2 options, Get up 2 or so hours earlier for my teacher to how me how to do matrices, or learn from here. Great site, I highly recommend this site. Needs more problems to practice with though.
26 сент. 2010 г.
One of the five winners of the Google project http://www.project10tothe100.com/index.html. Highly recommended.
23 сент. 2010 г.
Best site on net that aggregates free higher education vids. All individually done by one man. Bravo, cannot recommend enough if you're struggling to learn a collegiate topic.
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7 янв. 2010 г.
Just an incredible site
25 июня 2009 г.
Very helpful site for all your math needs, best site ever!
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Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. Khan Academy is a nonprofit with the mission of providing a free, world-class education for anyone, anywhere.
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