Вычислим выражения:
1) (1/10 + 3/5) * 15 = (1/10 + 6/10) * 15 = 7/10 * 15 = 7/2 * 3 = 21/2 = 10,5;
2) 12 * (2/3 - 1/4) = 12 * 2/3 - 12 * 1/4 = 8 - 3 = 5;
3) 1/10 + 3/5 * 1/4 = 1/10 + 3/20 = 2/20 + 3/20 = 5/20 = 1/4 = 0,25;
4) 2 1/2 - 3/5 * 5/6 = 2 1/2 - 1/2 = 2.
Вычислим выражения:
1) (1/10 + 3/5) * 15 = (1/10 + 6/10) * 15 = 7/10 * 15 = 7/2 * 3 = 21/2 = 10,5;
2) 12 * (2/3 - 1/4) = 12 * 2/3 - 12 * 1/4 = 8 - 3 = 5;
3) 1/10 + 3/5 * 1/4 = 1/10 + 3/20 = 2/20 + 3/20 = 5/20 = 1/4 = 0,25;
4) 2 1/2 - 3/5 * 5/6 = 2 1/2 - 1/2 = 2.