Jawabanmu

2014-08-18T19:42:33+07:00
156a² + 117 ab - 96 ab - 72 b²
=156 a² + 21 ab - 72b²
Jawaban paling cerdas!
2014-08-18T19:42:41+07:00
(13a+12a) + (-8) + 9b =
13a + 12a - 8b + 9b = 25a - b.
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