Ответ:

Пошаговое объяснение:

1) (1/14 +2/21)*(5 1/2 - 2 1/14)= (3/42+4/42)* (11/2 - 29/14)= 7/42 * (77/14 -29/14)=

= 7/42 * 48/14= 4/7

2) (2 11/12 *6 + 7/48*8 -11 1/3) * ( 7/11 - 1/2) = (35/2 + 7/6 - 34/3) * 3/22=

= (105/6 +7/6 -68/6) * 3/22 = 44/6 * 3/22= 1

3) (15 3/14 - 7 4/35) * 1 1/9 - (2 1/6 +1/8) * 2 2/11= (213/14 - 249/35)* 10/9 -

- (13/6 + 1/8) *24/11= (1065/70 - 498/70)* 10/9 - (52/24 + 3/24)*24/11=

= (567/70 * 10/9) - 55/24 * 24/11= 9 - 5= 4