dare to solve it so easy ☺️

Answer: 1.23×10¹⁶
Step-by-step explanation:
For this problem, we want to use order of operations to solve.
Parenthesis
Exponent
Multiply
Divide
Add
Subtract
Let's first solve the parenthesis.
[tex](9*\frac{999999999}{9+9+9+9+9+9+9+9+9} )^2[/tex] [add denominator]
[tex](9*\frac{999999999}{81} )^2[/tex] [cross multiply]
[tex](\frac{999999999}{9} )^2[/tex] [divide]
[tex](111111111)^2[/tex] [exponent]
1.23×10¹⁶
The ending result is way too large. Therefore, we use scientific notation and get 1.23×10¹⁶.