[tex]a)\frac{19}{36}-\frac{10}{36}o\frac{11}{16}-\frac{7}{16}[/tex]
[tex]\frac{19-10}{36}o\frac{11-7}{16}[/tex]
[tex]\frac{9}{36}o\frac{4}{16}[/tex]
[tex]\frac{1}{4}=\frac{1}{4}[/tex]
[tex]b)\frac{56-43}{20}o\frac{37-5}{31}[/tex]
[tex]\frac{13}{20}o\frac{32}{31}[/tex]
[tex]\frac{31*13}{620}o\frac{32*20}{620}[/tex]
[tex]\frac{403}{620}<\frac{640}{620}[/tex]
[tex]c)\frac{19+15}{17}o\frac{23-2}{9}[/tex]
[tex]\frac{34}{17}o\frac{21}{9}[/tex]
[tex]2o\frac{7}{3}[/tex]
[tex]2<\frac{7}{3}=2,33[/tex]
[tex]d)\frac{9+11}{25}o\frac{87-7}{100}[/tex]
[tex]\frac{20}{25}o\frac{80}{100}[/tex]
[tex]\frac{4}{5}o\frac{4}{5}[/tex]
[tex]\frac{4}{5}=\frac{4}{5}[/tex]
