27,4:18,3

To simplify the expression \( \frac{27}{4} : \frac{18}{3} \), we need to divide the fractions by multiplying by the reciprocal of the second fraction. So, it becomes: \[ \frac{27}{4} \times \frac{3}{18} \] Now, calculate it: \[ \frac{27}{4} \times \frac{3}{18} = \frac{81}{72} = \frac{9}{8} \] Therefore, the simplified expression is \( \frac{9}{8} \).