Sagot :
Bonjour,
[tex] \frac{70}{18} = \frac{70 \div 2}{18 \div 2} = \frac{35}{9} [/tex]
[tex] \frac{42}{39} = \frac{42 \div 3}{39 \div 3} = \frac{14}{13} [/tex]
[tex] \frac{56}{72} = \frac{56 \div 8}{72 \div 8} = \frac{7}{9} [/tex]
[tex] \frac{84}{144} = \frac{84 \div 12}{144 \div 12} = \frac{7}{12} [/tex]
Bonjour !
70/18 = (35*2) / (9*2) = 35/9
42/39 = (14*3) / (13*3) = 14/13
56/72 = (7*8) / (9*8) = 7/9
84/144 = (7*12) / (12*12) = 7/12
J'espère t'avoir aidé. Bon courage !