Решите пожалуйста! а) 7.2a - 8.1a + 3.7a =
б) 6a * 2b^2 - 3ab * (-5b) - 17ab^2 =
в) 3a - 5ab - 2a + 9 ab =
г) 3.8a - 5.3a + 7.4a =
д) 3a * 7b^2 - 2ab * (-3b) - 15ab^2 =
е) 5a + 11 ab - 3a - 8ab =
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