Question

Buna ! Ma ajuta cineva ?  Calculati:
S=2+4+6+8+ ...... +200

2. Calculati pe x , din $\frac{x}{6}= \frac{2}{3}$

Answer 1

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

S=2*(1+100)*100/2=

S= (1+100)*100

S=101*100

S=10100

2)x= 6*2/3=  2*2=4