Question

(5¹⁹:5¹⁷-4):7

 

Answer 1

\(\left(5^{19}:5^{17}-4\right):7\)

\(=\left(5^2-4\right):7\)

\(=\left(25-4\right):7\)

\(=21:7\)

\(=3\)

Answer 2

\(\left(5^{19}\div5^{17}-4\right)\div7\)

\(=\left(5^2-4\right)\div7\)

\(=\left(25-4\right)\div7\)

\(=21\div7\)

\(=3\)