Question

Cat este 3+6+9+...+300​

Answer 1

S=3+6+9+...+300

S=300+297+294+...+3

_____________________________

2S=303+303+303+...+303

Sunt 100 de termeni in sir

303x100=30300 (2S)

S=30300:2

S=15150

Answer 2

Explicație pas cu pas:

3+6+9+...+300=(300+3)×100:2

=303×50

=15150