Jawabanmu

2014-09-01T18:41:56+07:00
156a² + 117ab - 96ab - 72b²
156a² + 21ab - 72b²
2014-09-01T18:42:30+07:00
(13a -8b) + (12a+9b)
=13a+12a-8b+9b
=25a+1b

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