РЕШИТЕ ПРИМЕР! (1/2 + 1/5) : 2- 3/10 = 7/8 : 3 - 1/24 * 5 =

№1

(1/2 + 1/5) : 2 - 3/10 = (5/10 + 2/10) : 2 - 3/10 = 7/10 : 2 - 3/10 = 7/10 : 2/1 - 3/10 = 7/10 * 1/2 - 3/10 = 7/20 - 3/10 = 7/20 - 6/20 = 1/20.

1) 1/2 + 1/5 = 5/10 + 2/10 = 7/10;

2) 7/10 : 2 = 7/10 : 2/1 = 7/10 * 1/2 = 7/20;

3) 7/20 - 3/10 = 7/20 - 6/20 = 1/20.

№2

7/8 : 3 - 1/24 * 5 = 7/8 : 3/1 - 1/24 * 5 = 7/8 * 1/3 - 1/24 * 5 = 7/24 - 1/24 * 5 = 7/24 - 1/120 = 35/120 - 1/120 = 34/120 = 17/60.

1) 7/8 : 3 = 7/8 : 3/1 = 7/8 * 1/3 = 7/24;

2) 1/24 * 5 = 1/120;

3) 7/24 - 1/120 = 35/120 - 1/120 = 34/120 = 17/60.