3,212:4/5=                        43,75.  2/35=   1,5/3,2  +  1,9/9,6=

1)3.212*5/4=4.015 2)43.75*2/35=1.25*2=2.5 3)15/32+19/96=64/96=2/3

[latex]3,212:\frac{4}{5}=3,212:0,8=4,015 [/latex]   [latex]43,75\cdot\frac{2}{35}=\frac{43,75\cdot2}{35}=\frac{87,5}{35}=2,5[/latex]   [latex]1,5:3,2+1,9:9,6=\frac{2}{3}[/latex]   1) [latex]1,5:3,2=1\frac{5}{10}:3\frac{2}{10}=1\frac{1}{2}:3\frac{1}{5}=\frac{3}{2}:\frac{16}{5}=\frac{3}{2}\cdot\frac{5}{16}=\frac{15}{32}[/latex]   2) [latex]1,9:9,6=1\frac{9}{10}:9\frac{6}{10}=\frac{19}{10}:9\frac{3}{5}=\frac{19}{10}:\frac{48}{5}=\frac{19}{10}\cdot\frac{5}{48}=\frac{19}{96}[/latex]   3) [latex]\frac{15}{32}+\frac{19}{96}=\frac{45+19}{96}=\frac{64}{96}=\frac{2}{3}[/latex]