bonsoir
a = - 1 ; b = 1/3 et c = 2/5
a/b + c = - 1 : 1/3 + 2/5 = - 1 * 3 + 2/5 = - 3 + 2/5 = - 15/5 + 2/5 = - 13/5
a + b /c = - 1 + 1.3 : 2/5 = - 1 + 1/3 * 5/2 = - 1 + 5/5 = - 5/5 + 5/5 = 0
a/b + cb = - 1 : 1/3 + 2/5 * 1/3 = - 1 * 3 + 2/15 = - 3 + 2/15 = - 45 /15 + 2/15 = - 43/15
a = 1/2 et b = 5/4 et c = 3/4
B = 1/2 + 5/4 : 3/4 = 1/2 + 5/4 * 4/3 = 1/2 + 20/12 = 6/12 + 20/12 = 26/12 = 13/6
C = 1/2 : 5/4 + 3/4 * 5/4
= 1/2 * 4/5 + 15/16
= 4/10 + 15/16 = 32/80 + 75/80 = 107/80