Jawabanmu

Jawaban paling cerdas!
2014-09-01T14:48:10+07:00
10a^2 - a^2 + 4a + 6b^2 - 4b^2 - b
= 9a^2 + 4a + 2b^2 - b

semoga membantu
2 5 2
2014-09-01T14:51:43+07:00