1/17+2/15*17+2/13*15+2/11*3+2/9*11+2/7*9+2/5*7+2/3*5 помогите плиз даю 34 бала больше нету

Question

1/17+2/15*17+2/13*15+2/11*3+2/9*11+2/7*9+2/5*7+2/3*5

помогите плиз даю 34 бала больше нету

Comments

в четвертом слагаемом точно 3, а не 13?

Answer 1

1) 1/17 + 2/(15*17) = (15+2)/(15*17) = 17/(15*17) = 1/15

2) 1/15 + 2/(13*15) = (13 + 2)/(15*13) = 15/(15*13) = 1/13

3) 1/13 + 2/(11*13) = (11+2)/(11*13) = 13/(11*13) = 1/11

4) 1/11 + 2/(11*9) = (9+2)/(11*9) = 11/(11*9) = 1/9

5) 1/9 + 2/(7*9) = (7+2)/(7*9) = 9/(7*9) = 1/7

6) 1/7 + 2/(5*7) = (5+2)/(5*7) = 7/(5*7) = 1/5

7) 1/5 + 2/(3*5) = (3+2)/(3*5) = 5/(3*5) = 1/3

Ответ: 1/3