N511 найдите значение выражений:

Пошаговое объяснение:

1) (2/7+7/2)×14/3=(4/14+49/14)×14/3=(53/14)×14/3=53/3=17 целых и 2/3

2) (21/5-11/4)×40/19= (84/20-55/20)×40/19= (29/20)×40/19=58/19=3 целыхи 1/19

Остальные аналогично

1) (2/7 + 3 1/2)* 4 2/3 = (2/7 + 7/2) + 14/3 = (4+49)/14 * 14/3 = 53/14 * 14/3 = 53/3 = 17 2/3;
2) (4 1/5 - 2 3/4) * 2 2/19 = (21/5 - 11/4) * 40/19 = (84-55)/20 * 40/19 = 29/20 * 40/19 = 58/19 = 3 1/19;
3) (5 6/7 + 3 5/21)* 2 1/10 = (41/7 + 68/21)* 21/10 = (123+68)/21 * 21/10 = 191/21 * 21/10 = 19,1
4) (7 5/12 - 3 1/6)* 2 2/17 = (89/12 - 19/6)* 36/17 = (89-38)/12 * 36/17 = 51/12 * 36/17 = 9