Question

DAU COROANĂ ȘI FOLLOW!!​

Answer 1

Răspuns:

Explicație pas cu pas:

2/3*5 = 1/3 - 1/5

3/5*8 = 1/5 - 1/8

4/8*12 = 1/8 - 1/12

5/12*17 = 1/12 - 1/17

6/17*23 = 1/17 - 1/23

7/23*30 = 1/23 - 1/30

2/3*5 + 3/5*8 + 4/8*12 + 5/12*17 + 6/17*23 + 7/23*30

= 1/3 - 1/5 + 1/5 - 1/8 + 1/8 - 1/12 + 1/12 - 1/17 + 1/17 - 1/23 + 1/23 - 1/30

= 1/3 - 1/30 = 10/30 - 1/30 = 29/30