Question

Calcula: S=0.1+0.3+0.5+0.7+...+9.9

Answer 1

Respuesta:

Explicación paso a paso:

$S = 0.1 + 0.3 + 0.5 + 0.7 + ... + 9.9\\\\S = \frac{1}{10} + \frac{3}{10} + \frac{5}{10} + ... + \frac{99}{10} \\\\2n + 1 = 99\\2n = 100\\n = 50\\\\S = \frac{n^{2} }{10} \\\\S = \frac{50^{2} }{10} = \frac{2500}{10} = 250$