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2014-09-04T06:36:39+07:00
(3a-2b)³ = (3a-2b)²(3a-2b) = (9a² - 12ab + 4b²)(3a-2b) = 27a³ - 54a²b + 36ab² - 8b²

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2014-09-04T07:48:37+07:00
9a+9a-6ab-6ab-6ab-6ab+4b+4b= 18a + 8b