Question

suma cifrelor numarului 2 la puterea 7•5 la puterea 9+7 este

Answer 1

$2^7\cdot5^9+7 \\ \\ =2^7\cdot5^7\cdot25+7 \\ \\ =10^7\cdot25+7 \\ \\ =10000000\cdot25+7 \\ \\ =250000000+7 \\ \\ =250000007 \\ \\ S_c=2+5+0+0+0+0+0+0+7=2+5+7=14$