Exercice 1 :
Il faut isoler x :
x/15 = 14/25 <=> x = (14/25)*15 = 42/5 = 8,4
34/x = -17/3 <=> -17x = 34*3 = 102 <=> x = 102/-17 = -6
-5/6 = -4/x <=> -5x = -4*6 = -24 <=> x = -24/-5 = 24/5 = 4,8
4,5/8 = x/7,2 <=> (4,5*7,2)/8 = 4,05
-7/x = 1/2 <=> x = -7*2 = -14
Exercice 2 :
Troncature :
53/11 = 4,8
101/13 = 7,7
52/89 = 0,5
Arrondi :
53/11 = 4,82
101/13 = 7,77
52/89 = 0,58
Voilà j'espère que ca t'a aidé !
