Question

Calculați:
2+4+6+8+...+200
_________
Va rog ajuta.ti.ma!Cu cat mai rapid cu atât mai bine!Dau coroana!

Answer 1

2+4+6+...+200=2(1+2+3+...+100)=
=2*100*101/2=100*101=10100

Answer 2

2+4+6+8+...+200=

2(1+2+3+...+100)=

2 x (100x101)\2=

2 x 10100\2=

2 x 5050=

=10100

Succes!