2,52:1,8-0,9

To perform the calculation of \(2.52 \div (1.8 - 0.9)\), we need to first subtract 0.9 from 1.8 and then divide 2.52 by the result.

Step 1: Calculate \(1.8 - 0.9\): \(1.8 - 0.9 = 0.9\)

Step 2: Divide 2.52 by 0.9: \(2.52 \div 0.9 = 2.8\)

Therefore, the result of the expression \(2.52 \div (1.8 - 0.9)\) is 2.8.