Выполните действия 3/8:5/12-3 1/2*2/5+1:3 1/3; 1 1/4 * (-2 2/3) + 4/5*2 11/12-1 1/6:21/22

1) 3/8 : 5/12 - 3 1/2 * 2/5 + 1 : 3 1/3 = 3/8 * 12/5 - (3 * 2 + 1) / 2 * 2/5 + 1 : (3 * 3 + 1) / 3 = 3/8 * 12/5 - 7/2 * 2/5 + 1 : 10/3 = 36/40 - 7/5 + 1 * 3/10 = 9/10 - 14/10 + 3/10 = - 2/10 = - 1/5;

Ответ: - 1/5.

2) 1 1/4 * (-2 2/3) + 4/5 * 2 11/12 - 1 1/6 : 21/22 = - 5/4 * (2 * 3 + 2) / 3 + 4/5 * (2 * 12 + 11) / 12 - 7/6 : 21/22 = - 5/4 * 8/3 + 4/5 * 35/12 - 7/6 * 22/21 = - 10/3 + 7/3 - 11/9 = - 30/9 + 21/9 - 11/9 = (-30 + 21 - 11) / 9 = - 20/9;

Ответ: - 20/9.