Question

2b - 2/5 умножить b , если b= 4 3/5

Answer 1

2b - b • 2/5 =
= 2b - 2b/5 =
= 10b/5 - 2b/5 = 8b/5

b = 4 3/5
8b/5 = (8 • 4 3/5) / 5 =
= 8 • 23/5 : 5 =
= 8 • 23/25 = 184/25 = 7 9/25

Answer 2

Ответ:

7 9/35

Пошаговое объяснение:

2b - 2/5 * b, при b= 4 3/5 = 23/5

2*23/5 - 2/5*23/5 = 46/5 - 46/25 = (46*5 - 46)/25 = 184/25 = 7 9/35

Или так:

2b - 2/5b = 1 3/5b = 8/5b

8/5b = 8/5 * 23/5 = 184/25 = 7 9/35