23,535:0,9-0,522:0,6+0,902:2,2

To solve the mathematical expression \( 23,535 : 0,9 - 0,522 : 0,6 + 0,902 : 2,2 \), we should perform each division first and then follow the order of operations (subtraction and addition).

1. Calculate \( 23,535 \div 0,9 \): \[ 23,535 \div 0,9 = 26,150 \]

2. Calculate \( 0,522 \div 0,6 \): \[ 0,522 \div 0,6 \approx 0,87 \]

3. Calculate \( 0,902 \div 2,2 \): \[ 0,902 \div 2,2 \approx 0,409 \]

Now, substituting these results back into the original expression: \[ 26,150 - 0,87 + 0,409 \]

4. Now perform the subtraction: \[ 26,150 - 0,87 = 25,280 \]

5. Finally, add \( 0,409 \): \[ 25,280 + 0,409 = 25,689 \]

So, the final result of the expression \( 23,535 : 0,9 - 0,522 : 0,6 + 0,902 : 2,2 \) is: \[ \boxed{25,689} \]