[tex]a).6,38: \frac{19}{100} =6,38* \frac{100}{19} = \frac{638}{19} =33,57 \\ \\ b). \frac{25}{9} :2,(7)= \frac{25}{9} : \frac{25}{9} = \frac{25}{9} * \frac{9}{25} = \frac{225}{225} =1 \\ \\ c).3,(63):1,(27)= \frac{360}{99} : \frac{126}{99} = \frac{360}{99} * \frac{99}{126} = \frac{35640}{12474} =2,857 \\ \\ d). \frac{4}{75} :0,3(7)= \frac{4}{75} : \frac{34}{90} = \frac{4}{75} * \frac{90}{34} = \frac{360}{2550} =0,141[/tex]
