6c(6c+6) - (6c-6)(6c+6)
(6c+6)(6c -(6c-6))
(6c+6)(6c-6c+6)
6(6c+6)
При с = 13,5 получаем:
6(6*13,5+6) = 6(81+6) = 6*87 = 522
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6c(6c+6) - (6c-6)(6c+6)
(6c+6)(6c -(6c-6))
(6c+6)(6c-6c+6)
6(6c+6)
При с = 13,5 получаем:
6(6*13,5+6) = 6(81+6) = 6*87 = 522