ضرب كثيرات الحدود

http://www.youtube.com/watch?v=KlVGlP_pGCo

http://www.youtube.com/watch?v=CHQPLT4lRgs

http://www.youtube.com/watch?v=wS2i7XC-6PQ

http://www.youtube.com/watch?v=yrKJj2rd4t4