28. Найдите значение выражения 1 – $$\frac{3}{8}$$ $$\cdot$$ 3$$\frac{1}{5}$$.

1) 3$$\frac{1}{5}$$ = $$\frac{3 \cdot 5 + 1}{5}$$ = $$\frac{15 + 1}{5}$$ = $$\frac{16}{5}$$

2) $$\frac{3}{8}$$ $$\cdot$$ $$\frac{16}{5}$$ = $$\frac{3 \cdot 16}{8 \cdot 5}$$ = $$\frac{3 \cdot 2}{1 \cdot 5}$$ = $$\frac{6}{5}$$ = 1$$\frac{1}{5}$$

3) 1 - 1$$\frac{1}{5}$$ = 1 - $$\frac{6}{5}$$ = $$\frac{5}{5}$$ - $$\frac{6}{5}$$ = -$$\frac{1}{5}$$ = -0,2

Ответ: -0,2