Опять пример:3/8*(-1 1/7)

[latex]\frac{3}{8}*(-1 \frac{1}{7})=-\frac{3}{8}*\frac{1*7+1}{7}=\\\\-\frac{3}{8}*\frac{8}{7}=-\frac{3*8}{8*7}=-\frac{3}{7}[/latex]

3/8 * (-1 1/7) = 3/8 * (-8/7) = -3/7