12n(12n + 12) - (12n - 12)(12 + 12n) = 144n² + 144n - (144n² - 144) =
= 144n² + 144n - 144n² + 144 = 144n + 144 = 144(n + 1) = 144(5,1 + 1) =
= 144 * 6,1 = 878,4
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12n(12n + 12) - (12n - 12)(12 + 12n) = 144n² + 144n - (144n² - 144) =
= 144n² + 144n - 144n² + 144 = 144n + 144 = 144(n + 1) = 144(5,1 + 1) =
= 144 * 6,1 = 878,4