Найдите значение выражения 51/3*2 1/4:4/5, (2 1/2 +1 1/3): 1/6-5 3/7

а) 5 1/3 * 2 1/4 / 4/5 = 15;

1) 5 1/3 *2 1/4 = 16/3 * 9/4 = 16 * 9/3 * 4 = 4 * 3/1 * 1 = 12/1 = 12;

2) 12 / 4/5 = 12 * 5/4 = 12 * 5/4 * 1 = 3 * 5/1 * 1 = 15/1 = 15;

б) (2 1/2 + 1 1/3) / 1/6 - 5 3/7 =  17 4/7;

1) 2 1/2 + 1 1/3 = 5/2 + 4/3 = 15/6 + 8/6 = (15 + 8)/6 = 23/6 = 3 5/6;

2) 3 5/6 / 1/6 = 23/6 / 1/6 = 23/6 * 6/1 = 23 * 6/6 * 1 = 23 * 1/1 * 1 = 23/1 = 23;

3) 23 - 5 3/7 = 22 7/7 - 5 3/7 = 17 4/7;