Упр.18.35 ГДЗ Мордкович 7 класс (Алгебра)

б) (-1*1/4)3 + (2*1/8)2.

а)

$$ \left(2\frac{2}{3}\right)^3-\left(1\frac{2}{3}\right)^3 = \left(\frac{8}{3}\right)^3-\left(\frac{5}{3}\right)^3 = \frac{512}{27}-\frac{125}{27} = \frac{387}{27} = 14\frac{9}{27} = 14\frac{1}{3}. $$

б)

$$ \left(-1\frac{1}{4}\right)^3+\left(2\frac{1}{8}\right)^2 = \left(-\frac{5}{4}\right)^3+\left(\frac{17}{8}\right)^2 = -\frac{125}{64}+\frac{289}{64} = \frac{164}{64} = \frac{41}{16} = 2\frac{9}{16}. $$

Ответ

а) $$14\frac{1}{3}$$; б) $$2\frac{9}{16}$$.