Question

Cum se rezolva exuatia:
$\frac{2}{5 } + \frac{5}{5} + \frac{8}{5} + ......... + \frac{224}{5} =$

Answer 1

$\frac{2 + 5 + 8 + .... + 224}{5} = \\ \frac{(224 + 2) \times((224 - 2) \div 3 + 1) \div 2 }{5} = \frac{226 \times (222 \div 3 + 1) \div 2}{5} = \frac{226 \div 2 \times 75}{5} = 113 \times 15 = 1695$