Question

Calculeaza suma:s=5+10+15+30+....500.​

Answer 1

Răspuns:

25.250

Explicație pas cu pas:

s = 5(1+2+3+...+100) = (suma Gaus)

5 x 100(1+100)/2 =

5 x 50 x 101 =

250 x 101 =

25250.

Answer 2

$5 + 10 + 15 + ... + 500 \\ = 5 \times (1 + 2 + 3 + ... + 100) \\ = 5 \times \frac{100(100 + 1)}{2} \\ =\frac{5\times 100 \times 101}{2} \\= \frac{500×101}{2}\\ = \frac{50500}{2}\\= 25250$