Bonjour ! J'espère vous aider !
Réponse :
Exercice 18 :
[tex]a.\frac{6}{9} =\frac{3*2}{3*3} =\frac{2}{3} \\\\b.\frac{8}{14} =\frac{2*4}{2*7} =\frac{4}{7}\\\\c.\frac{25}{15} =\frac{5*5}{5*3} =\frac{5}{3}\\\\d.\frac{16}{12} =\frac{4*4}{4*3} =\frac{4}{3}[/tex]
Exercice 19 :
[tex]a.\frac{21}{14} =\frac{7*3}{7*2} =\frac{3}{2} \\\\b.\frac{12}{27} =\frac{3*4}{3*9} =\frac{4}{9}\\\\c.\frac{36}{42} =\frac{6*6}{6*7} =\frac{6}{7}\\\\d.\frac{30}{35} =\frac{5*6}{5*7} =\frac{6}{7}[/tex]
Exercice 20 :
[tex]a. \frac{40}{24} =\frac{8*5}{8*3} =\frac{5}{3} \\\\b.\frac{36}{27} =\frac{9*4}{9*3} =\frac{4}{3}\\\\c.\frac{36}{60} =\frac{12*3}{12*5} =\frac{3}{5}\\\\d.\frac{45}{75} =\frac{15*3}{15*5} =\frac{3}{5}[/tex]
Exercice 21 :
[tex]a. \frac{56}{42} =\frac{14*4}{14*3} =\frac{4}{3} \\\\b. \frac{20}{50} =\frac{10*2}{10*5} =\frac{2}{5} \\\\c. \frac{200}{600} =\frac{200}{200*3} =\frac{1}{3} \\\\d. \frac{100}{125} =\frac{25*4}{25*5} =\frac{4}{5}[/tex]
