Question

2+4+6+...+66. 3+6+9+...+207. 4+8+12+...+184 repede pls dau coroana. ​

Answer 1

Răspuns:

1 + 2 + 3 + 4 + … + n = n x ( n + 1 ) : 2 suma lui Gauss

2+4+6+...+66=

2(1+2+3+..+33)=

2×33×34:2=

1122

3+6+9+...+207=

3(1+2+3+..+69)=

3×69×70:2=

7245

4+8+12+...+184=

4(1+2+3+...+46)=

4×46×47:2=

4324