1)(1,6+1,8)*0,5=1,72)1[latex] frac{7}{15} [/latex] / 2,2= [latex] frac{22}{15} [/latex]/[latex] frac{22}{10} [/latex]=[latex] frac{2}{3} [/latex]3) ([latex] frac{5}{4} [/latex]+[latex] frac{1}{6} [/latex])*2,4=[latex] frac{17}{12}* frac{24}{10} = 3 frac{2}{5} [/latex]