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Sagot :

F= 11/15 -3/5
=11/15-9/15
=2/15

G=(3/ 4 - 1/2 )/ 4/5 
=(3/4-2/4)/4/5
=1/4 x 5/4
=5/16
F= 11/15 - 9/15
F= 2/15

G= 3/4 - 2/4
G= 1/4 soit 0,25

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