Нужно решить буквы "а" и "б", по действиям

а) 11/15*(4 1/2 - 3 2/5:17/20) + 1 11/20  = 1 1/12

1) 3 2/5 : 17/20 = 17/5*20/17 = 4

2) 4 1/2 - 4 = 1/2

3) 11/15*1/2 = 11/30

4)11/30 + 1 11/20 = 1 55/60 = 1 1/12

Б) 7 2/3 + 4 1/6*(6 2/7 - 3 5/7)  = 17 2/3

1)6 2/7 - 3 5/7 = 5-3+9/7-5/7 = 2 4/7

2)4 1/6*2 4/7 = 25/6*18/7 = 10

3) 7 2/3 + 10  =17 2/3

Ответ:

Пошаговое объяснение:

a)

1) 3 2/5 : 17/20 = 17/5 * 20/17 = 4

2) 4 1/2 - 4 = 1/2

3) 11/15 * 1/2 = 11/30

4) 11/30 + 1 11/20 = 22/60 + 1 33/60 = 1 55/60 = 1 11/12

ответ: 1 11/12

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б)

1) 5 2/15 * 3/22 = 77/15 * 3/22 = 7/10

2) 7/10 + 1 14/15 = 21/30 + 1 28/30 = 1 49/30 = 2 19/30

3) 5 4/7 : 1 5/21 = 39/7 : 26/21 = 39/7 * 21/26 = 9/2 = 4 1/2

4) 4 1/2 - 2 19/30 = 4 15/30 - 2 19/30 = 1 26/30 = 1 13/15

ответ: 1 13/15