[latex]( 7-1frac{5}{12}) : 6,7 + ( 5,75-3 frac{1}{6} ) : 15,5= frac{226}{201}[/latex] [latex]1) 7- 1 frac{5}{12}=6 frac{5}{12}[/latex][latex]2) 6 frac{5}{12}: frac{67}{10}= frac{77}{12} * frac{10}{67}= frac{770}{804} =frac{385}{402} [/latex][latex]3) frac{575}{100} - frac{19}{6} = frac{3450-1900}{600} =frac{1550}{600} [/latex][latex]5) frac{1}{6} + frac{385}{402}= frac{385+67}{402} = frac{226}{201} [/latex][latex]4) frac{1550}{600}: frac{155}{10} = frac{1550}{600}* frac{10}{155}= frac{1}{6} [/latex]