Question

Ajutați-mă va rog cu acest exercitiu:
n=
$100 + 2 \times (1 + 2 + 3 + ..... + 99)$

Answer 1

n=100+2×(1+2+3+...+99)

n=100+2×[99×(99+1)÷2]

n=100+2×(99×100÷2)

n=100+2×(9900÷2)

n=100+2×4950

n=100+9900

n=10000