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Sagot :

Exercice 4

a.3/4+11/12=3*3/4*3+11/12=9/12+11/12=20/12=10/6=5/3

b.5/6-7/18=5*3/6*3-7/18=15/18-7/18= 8/18=4/9

Exercice 5

a.7/4*2/3=14/12=7/6

b.6/5*25/12=150/60=75/30

c.17/8,1*8,1/7=137,7/56,7

d.12/7*14/15=168/105

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