Bonjour
Ecrire F sous le forme d une fraction irréductible.
F=1/3-3/4÷5/6+2/5×4/3
F = 1/3 - 3/4 x 6/5 + 8/15
F = 1/3 - 18/20 + 8/15
F = (1 x 20) / (3 x 20) - (18 x 3) / (20 x 3) + (8 x 4) / (15 x 4)
F = 20/60 - 54/60 + 32/60
F = - 2/60
F = (2 x - 1) / (2 x 30)
F = - 1/30.
