\[\frac{1,35}{3\frac{3}{4}} = 1,35\ :3\frac{3}{4} = \frac{135}{100}\ :\frac{15}{4} =\]
\[= \frac{135}{100} \cdot \frac{4}{15} = \frac{9 \cdot 15 \cdot 4}{25 \cdot 4 \cdot 15} = \frac{9}{25} = \frac{36}{100} = 0,36\]