Question

S=2+4+6+...+96+98+100 CALCULATI SUMA

Answer 1

2(1+2+3+...+48+49+50)
2[(50+1)*50:2]
2(51*50:2)
2(2550:2)
2550 (pentru ca 2 se anuleaza)

sper ca ti-am fost de ajutor, in caz ca te intreaba cineva, l-am rezolvat cu suma lui Gaus

Answer 2

$\displaystyle 2+4+6+...+96+98+100=2(1+2+3+...+50)= \\ \\ =2 \times \frac{50(50+1)}{2} =2 \times \frac{50 \times 51}{2} =\not2 \times \frac{2550}{\not2} =2550$