Question

615. Вычислите:
ПОМОГИТЕ СРОЧ А ТО МАТЕМАТИЧКА ПО ШЕЕ НАДАЁТ
ДАМ 50 балов

Answer 1

Пошаговое объяснение:

№1

1) -5/12 - 3/4 = -5/12 - 9/12 = -14/12 = -7/6

2) -7/6 : 2 1/3 = -7/6 : 7/3 = -7/6 * 3/7 = -1/2 * 1/1 = -1/2

3) 5 1/3 * 0,75 = 16/3 * 3/4 = 4/1 * 1/1 = 4/1 = 4

4) -1/2 + 4 = -1/2 + 3 2/2 = 3 1/2

№2

1) -2,5 - 1 5/6 = -2 5/10 - 1 5/6 = -2 15/30 - 1 25/30 = -3 40/30 = -4 10/30 = -4 1/3

2) -4 1/3 : 1 4/9 = -13/3 : 13/9 = -13/3 * 9/13 = -1/1 * 3/1 = -3/1 = -3

4) 3 5/9 * (-2 1/4) = 32/9 * (-9/4) = 8/1 * (-1/1) = -8/1 = -8

5) -3 - (-8) = -3 + 8 = 5

№3

1) -3,8 + 2 1/3 = -3 8/10 + 2 1/3 = -3 24/30 + 2 10/30 = -1 14/30 = -1 7/15

2) -1 7/15 * (-1 7/8) = -22/15 * (-15/8) = -11/1 * (-1/4) = 11/4 = = 2 3/4

3) 4 1/6 : (-1 2/3) = 25/6 : (-5/3) = 25/6 * (-3/5) = 5/2 * (-1/1) = -5/2 = -2 1/2

4) 2 3/4 + (-2 1/2) = 2 3/4 - 2 2/4 = 1/4