Ответ:

-4 17/42

Пошаговое объяснение:

1) 1 3/7 - 2 3/4 = 1 12/28 - 2 21/28 = -1 9/28

2) -1 9/28 * 3 1/3 = -37/28 * 10/3 = -37/14 * 5/3 = -185/42 = -4 17/42

[tex](1 \frac{3}{7} - 2 \frac{3}{4} ) \times 3 \frac{1}{3} = (1 \frac{12}{28} - 2 \frac{21}{28} ) \times \frac{10}{3} = - 1 \frac{9}{28} \times \frac{10}{3} =\\= - \frac{37 \times 10}{28 \times 3} = - \frac{37 \times 5}{14 \times 3} = - \frac{185}{42} = - 4 \frac{17}{42} [/tex]