3/6:4,9=?13:0,65=?18:45%=?18:37,5%=?

[latex] \frac{3}{6} :4,9= \frac{3}{6} : \frac{49}{10}= \frac{3}{6} * \frac{10}{49}= \frac{30}{294} = \frac{5}{49} [/latex] [latex]13:0,65= \frac{13}{1} :\frac{65}{10}= \frac{13}{1}* \frac{10}{65}= \frac{130}{65}=2 [/latex] [latex]18:45=18:0,45=18: \frac{45}{100}= \frac{18}{1}* \frac{100}{45} = \frac{1800}{45} =40[/latex] [latex]18:37,5=18:0,375= \frac{18}{1} : \frac{375}{100}= \frac{18}{1} * \frac{100}{375} = \frac{1800}{375}= \frac{24}{5}=4 \frac{4}{5} [/latex]