Bonjour,
20/42 = 10/21 = (5 * 3)/(7 * 3) = 5/7.
40/88 = 20/44 = 10/22 = (5 * 2)/(11 * 2) = 5/11.
50/350 = (50 * 1)/(50 * 7) = 1/7.
60/120 = (60 * 1)/(60 * 2) = 1/2.
66/180 = 33/90 = (11 * 3)/(3 * 30) = 11/30.
Réponse :
Explications étape par étape
20/42=10*2/21*2=10/21
40/88=10*4/22*4=10/22=5*2/11*2=5/11
50/350=5*10/35*10=5/35=1*5/7*5=1/7
60/120=1*60/2*60=1/2
66/180=33*2/90*2=33/90=11*3/30*3=11/30