Выполни действия (2 цел4/5+1 цел2/3) * 15 цел; (3 цел. 3/4+9 цел1/6) * 1 цел. 1/5;; 15 цел.*4/15 - (10 цел. 1/2*2/3) * 3/14;;. 4 цел. 2/3+7/15*1 цел. 11/14-1 цел1/5

1) (2 4/5 + 1 2/3) * 15 = ((2 * 5 + 4) / 5 + (1 * 3 + 2) / 3) * 15 = (14/5 + 5/3) * 15 = ((14 * 3) / 15 + (5 * 5) / 15) * 15 = (42/15 + 25/15) * 15 = 67/15 * 15 = 67.

2) (3 3/4 + 9 1/6) * 1 1/5 = ((3 * 4 + 3) / 4 + (9 * 6 + 1) / 6) * (1 * 5 + 1) / 5 = (15/4 + 55/6) * 6/5 = ((15 * 6) / 24 + (55 * 4) / 24) * 6/5 = (90/24 + 220/24) * 6/5 = (90 + 220) / 24 * 6/5 = 310/24 * 6/5 = 15.5.

3) 15 * 4/15 - (10 1/2 * 2/3) * 3/14 = 4 - ((10 * 2 + 1) / 2 * 2/3) * 3/14 = 4 - (21/2 * 2/3) * 3/14 = 4 - 7 * 3/14 = 4 - 3/2 = 4 - 1.5 = 2.5.

4) 4 2/3 + 7/15 * 1 11/14 - 1 1/5 = (4 * 3 + 2) / 3 + 7/15 * (1 * 14 + 11) / 14 - (1 * 5 + 1) / 5 = 14/3 + 7/15 * 25/14 - 6/5 = 14/3 + 5/6 - 6/5 = (14 * 10) / 30 + (5 * 5) / 30 - (6 * 6) / 30 = 140/30 + 25/30 - 36/30 = (140 + 25 - 36) / 30 = 129/30 = 4,3.