16. Найдите 12А, если A =1/3*4+1/4*5+1/5*6​

А= 1/3*4+1/4*5+1/5*6

1) 1/3*4 = 4/3 = 1 1/3

2) 1/4*5 = 5/4 = 1 1/4

3) 1/5 * 6 = 6/5 = 1 1/5

4) 1 1/3 + 1 1/4 = 1 4/12 + 1 3/12 = 2 7/12

5) 2 7/12 + 1 1/5 = 2 35/60 + 1 12/60 = 3 47/60

A = 3 47/60

12 * 3 47/60 = 12* 227/60 = 227/5 = 45 2/5

ответ: 45 2/5