9а+18/9 -9а*а

To simplify the expression \( 9a + \frac{18}{9} - 9a \cdot a \), we can follow these steps:

1. Simplify \( \frac{18}{9} \): \[ \frac{18}{9} = 2 \]

2. Rewrite the expression using the simplification above: \[ 9a + 2 - 9a^2 \]

3. Combine like terms: \[ (9a - 9a^2) + 2 \] The terms \( 9a - 9a^2 \) do not combine directly since they are different degrees.

The final simplified expression is: \[ -9a^2 + 9a + 2 \]