3•(5+2):2

To simplify the expression \( 3 \cdot (5 + 2) : 2 \), we will follow the order of operations.

1. First, calculate the expression inside the parentheses: \[ 5 + 2 = 7 \]

2. Now, substitute the result back into the expression: \[ 3 \cdot 7 : 2 \]

3. Next, we can interpret the colon (:) as division, so we rewrite the expression as: \[ \frac{3 \cdot 7}{2} \]

4. Multiply \( 3 \cdot 7 \): \[ 3 \cdot 7 = 21 \]

5. Now divide by 2: \[ \frac{21}{2} = 10.5 \]

So, the final result of the expression \( 3 \cdot (5 + 2) : 2 \) is \( 10.5 \).