Question

$789 \sqrt{23 \sqrt{9} }$

Answer 1

$\mathtt{789\sqrt{23\sqrt{9}}}$

9  |3
3   |3
1 

$\mathtt{789\sqrt{23\sqrt{3^2}}} \\ \\ \mathtt{\mathtt{789\sqrt{23~.~3}}} \\ \\ \mathtt{789\sqrt{69}}$