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Réponse :

A= [tex]\frac{4}{5} +\frac{3}{10} =\frac{4X2}{5X2} + \frac{3}{10} =\frac{8}{10} +\frac{3}{10} =\frac{11}{10}[/tex]

B=[tex]\frac{7}{10} +\frac{3}{100} =\frac{7X10}{10X10} +\frac{3}{100} =\frac{70}{100} +\frac{3}{100} =\frac{73}{100}[/tex]

C=[tex]\frac{2}{21} +\frac{8}{7} =\frac{2}{21} +\frac{8X3}{7X3} =\frac{2}{21}+ \frac{24}{21}= \frac{26}{21}[/tex]

D=[tex]\frac{5}{3} -\frac{20}{33}=\frac{5X11}{3X11} -\frac{20}{33}=\frac{55}{33} -\frac{20}{33}=\frac{35}{33}[/tex]

E=[tex]\frac{3}{8}+\frac{5}{16}=\frac{3X2}{8X2}+\frac{5}{16}=\frac{6}{16}+\frac{5}{16}=\frac{11}{16}[/tex]

F=[tex]\frac{34}{63} -\frac{2}{9}=\frac{34}{63}- \frac{2X7}{9X7}=\frac{34}{63} -\frac{14}{63}=\frac{20}{63}[/tex]

G=[tex]4+\frac{3}{7}=\frac{4X7}{1X7} +\frac{3}{7}=\frac{28}{7}+\frac{3}{7} =\frac{31}{7}[/tex]

H=[tex]\frac{48}{25}-1=\frac{48}{25}-\frac{1X25}{1X25}=\frac{48}{25}-\frac{25}{25}=\frac{23}{25}[/tex]

I=[tex]\frac{8}{9}-\frac{3}{4}=\frac{8X4}{9X4}-\frac{3X9}{4X9} =\frac{32}{36} -\frac{27}{36}=\frac{5}{36}[/tex]