(y:8+18)•9=540

Let's verify the expression step by step:

Given: \((8 + 18) \times 9\)

Step 1: Calculate inside the parentheses: \(8 + 18 = 26\)

Step 2: Multiply the result by 9: \(26 \times 9 = 234\)

So, \((8 + 18) \times 9 = 234\), not 540.