Question

5(3*7^15-19*7^14)/7^16+3*7^15

Answer 1

$frac{5(3*7^1^5-19*7^1^4)}{7^1^6+3*7^1^5} = frac{5*7^1^4(3*7-19)}{(7+3)*7^1^5} = \ frac{5*7^1^4*2}{10*7^1^5}= frac{10*7^1^4}{10*7^1^5} =7 ^{-1} = frac{1}{7}$