A student from 8 silver presenting the solution to p 318 #23:
http://www.showme.com/sh/?h=IZ8dNTs
A student from 8 purple presenting the solution to p 318 # 20:
http://www.showme.com/sh/?h=Vsl8YW8
A student from 8 purple presenting the solution to p 318 # 22:
http://www.showme.com/sh/?h=6sepqy0
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