Question

Помогите пожалуйста)))))))))​

Answer 1

Ответ:

7 7/20

1 9/10

Пошаговое объяснение:

а)

8 1/5 + 3/4 × (2 1/5 - 3 1/3) = 8 1/5 + 3/4 × (11/5 - 10/3) = 8 1/5 + 3/4 × (11/5 - 10/3) = 8 1/5 + 3/4 × ( (11×3) - (10×5) ) / (5×3) = 8 1/5 + 3/4 × (33 - 50) / 15 = 8 1/5 + 3/4 × (-17/15) = 8 1/5 - (3 × 17) / (4×15) = 8 1/5 - 17 / (4×5) = 8 1/5 - 17/20 = 41/5 - 17/20 = 164/20 - 17/20 = (164 - 17) / 20 = 147 / 20 = 7 7/20

б)

(5/6 -1/3) + (1/2 + 9/10) = (5/6 - 2/6) + (5/10 + 9/10) = 3/6 + 14/10 = 1/2 + 14/10 = 5/10 + 14/10 = 19/10 = 1 9/10

Answer 2

Ответ:

Пошаговое объяснение:

а.

1) 2 1/5 - 3 1/3 = 2 3/15 -

3 5/15 = -1 2/15

2) 3/4 * (-1 2/15) = 3/4 * (-17/15) = 1/4 * (-17/5) = -17/20

3) 8 2/5 + (-17/20) = 8 8/20 - 17/20 = 7 28/20 - 17/20 = 7 11/20

б.

1) 5/6 - 1/3 = 5/6 - 2/6 = 3/6 = 1/2

2) 1/2 + 9/10 = 5/10 + 9/10 = 14/10 = 1 4/10

3) 1/2 + 1 4/10 = 5/10 + 1 4/10 = 1 9/10