Ex 48 :
[tex] \frac{6 *5 }{12*5}= \frac{6 *5 *1 }{6*2*5} = \frac{1}{2} [/tex]
[tex] \frac{8*2}{9*2}= \frac{8}{9} [/tex]
[tex] \frac{4*6}{6*8}= \frac{2*2*6*1}{6*2*2*2}= \frac{1}{2} [/tex]
[tex] \frac{8*35}{17*8}= \frac{35}{17} [/tex]
[tex] \frac{12*14}{35*18}= \frac{2*6*2*7}{5*7*3*6}= \frac{4}{15} [/tex]
[tex] \frac{54*5}{6*63}= \frac{6*9*5}{6*9*7}= \frac{5}{7} [/tex]
Ex 49:
[tex] \frac{24}{75}= \frac{3*8}{3*25}= \frac{8}{25} [/tex]
[tex] \frac{72}{18}= \frac{18*4}{18*1} = \frac{4}{1}=4 [/tex]
[tex] \frac{100}{56}= \frac{4*25}{4*14}= \frac{25}{14} [/tex]
[tex] \frac{36}{54} =\frac{2*18}{3*18} = \frac{2}{3} [/tex]
L'étoile ( * ) signifie "multiplié".
