1. The problem is to evaluate the expression $25,6:4$. 2. First, we need to clarify the notation. The comma likely represents a decimal point, so $25,6$ means $25.6$. The colon $:$ is often used to denote division, so $25,6:4$ means $25.6 \div 4$. 3. The formula for division is $\frac{a}{b}$ where $a$ is the dividend and $b$ is the divisor. Here, $a=25.6$ and $b=4$. 4. Perform the division: $$25.6 \div 4 = \frac{25.6}{4}$$ 5. Simplify the fraction: $$\frac{25.6}{4} = 6.4$$ 6. Therefore, the final answer is $6.4$.