Question

4. Calculati: 1+2+3+.....+127=​

Answer 1

$1+2+3+.....+127= \\ 127 \times 128 \div 2 = \\ 16 \: 256 \div 2 = \\ = 8 \: 128$

Answer 2

Răspuns: $\red{\boxed{\bf S = 8~128}}$

Explicație pas cu pas:​

$\bf 1 + 2 + 3 + ..... +127 =$

$\bf S = (1 + 127)\cdot 127:2$

$\bf S = 128\cdot 127:2$

$\bf S = 64\cdot 127$

$\red{\boxed{\bf S = 8~128}}$