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triple de -7/15 = 3*(-7) / 15 = -7/5 = -1,4
produit de 7/15 x (15/-3) = 7/15 x (-5) = 7x(-5)/15 = -7/3 => opposé 7/3
= 5/11 x 11/5 x 2 = 2
-7/10 x 2/10 = -14/100 = -7/50
-7/10 + 8/10 = 1/10 => inverse 10
7/15 x 15/(-4) = -4/7 => inverse -7/4
-7/15 x 15(-2) = 7/2 = 3,5 => opposé -3,5
h - voir le c
