Jawabanmu

2014-09-11T08:18:13+07:00
(3a-6b+9c) x (2a+b+2c)
6a^2+3ab+6ac-12ab-6b^2-12bc+18ac+9bc+18c^2
6a^2+3ab+6ac+18ac-12ab-6b^2-12bc+9bc+18c^2
6a^2+3ab+24ac-12ab-6b^2-3bc+18c^2