Question

cate nr de forma a8a au suma cifrelor mai mare decat8 Dar mai mica decat 13.

Answer 1

$\overline{a8a}$

$8 < a + 8 + a < 13$

$8 < 2a + 8 < 13 \: | - 8$

$0 < 2a < 5 \: | \div 2$

$0 < a < 2.5 = (0;2.5)$

$a \: \in \: \mathbb{N} = > a \: \in \: \left\{1,2\right\}$

$=>2 \:numere\::\:181,282$

Answer 2

181

182

183

Sper ca te-am ajutat !