Решите удобным способом: 16,5⁴-15,5⁴
16.5^4 - 15.5^4 = (16.5^2 - 15.5^2) * (16.5^2 + 15.5^2) = = (16.5 - 15.5) * (16.5 + 15.5) * ((16.5 + 15.5)^2 - 2*16.5*15.5) = = 1 * 32 * (32^2 - 551.5) = 32 * (1024 - 551.5) = 32 * 472.5 = 15120
вот это да....