Срочно с пояснением !!!!!!!!

Ответ:

В решении.

Пошаговое объяснение:

1) (1 1/2 + 2/3) * 6 =

= (1 1/2 * 6) + (2/3 * 6) =

= (3/2 * 6) + (2/3 * 6) =

= 9 + 4 = 13;

2) 3 7/8 * 4/5 - 1 5/8 * 4/5 =

= (3 7/8 - 1 5/8) * 4/5 =

= 2 1/4 * 4/5 =

= 9/4 * 4/5 = 9/5 = 1,8;

3) 7 1/5 * 2 1/8 + 7 1/5 * 1 5/8 =

= 7 1/5 * (2 1/8 + 1 5/8) =

= 7 1/5 * 3 6/8 =

= 7 1/5 * 3 3/4 =

= 36/5 * 15/4 = 27;

4) 2/3 х + 1/3 х =

= х(2/3 + 1/3) =

= х * 1 = х.