Question

Решите удобным способом:
16,5⁴-15,5⁴

Answer 1

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

Answer 2

вот это да....