V = a * b * c a = 6 2/5 = 32/5 (м) b = 2 1/4 = 9/4 (м) c = 1 7/8 = 15/8 (м)
V = 32/5 * 9/4 * 15/8 = (4*9*3)/4 = 108/4 = 27 (куб.м) - объём прямоугольного параллелепипеда
Ответ: 27 куб.м.
1) <em>91 * 73=5</em>
(9-1)*(7-3) = 8*4 = 32
3 + 2 = 5
2) <em>83 * 96 = 6</em>
(8-3)*(9-6) = 5 * 3 = 15
1 + 5 = 6
3) <em>42 * 61 = 1</em>
(4-2)*(6-1) = 2 * 5 = 10
1 + 0 = 1
4) <em>31 * 82 = ?</em>
(3-1)*(8-2) = 2 * 6 = 12
1 + 2 = 3
Ответ: 31 * 82 = 3