BONJOUR Calculer E: 2/3x-11/8 pour: a) x=3 b)x=-1/2 c) x=3/4 d) x=-3/20

Bonsoir,

Calculer E: 2/3x-11/8 pour : 

a) x=3
E =  2/3x -11/8
E = 2/3 * 3 - 11/8
E = 6/3 - 11/8
E = 6 x 8 / 3 x 8 - 11 x 3 / 8 x 3
E = 48/24 - 33/48
E = 15/48
E = 3 x 5 / 3 x 16
E = 5/16

b)x=-1/2
E: 2/3x-11/8
E = 2/3 * - 1/2 - 11/8
E = - 2/6 - 11/8
E = - 2 x 4 / 6 x 4 - 11 x 3 / 8 x 3
E = - 8/24 - 33/24
E = - 41/24

c) x=3/4
E: 2/3x-11/8
E = 2/3 * 3/4 - 11/8
E = 6/12 - 11/8
E = 6 x 2 / 12 x 2 - 11 x 3 / 8 x 3
E = 12/24 - 33/24
E = - 21/24
E = 3 x - 7 / 3 x 8
E = - 7/8

d) x=-3/20
E: 2/3x-11/8
E = 2/3 * - 3/20 - 11/8
E = - 6/60 - 11/8
E = - 6 x 1 / 6 x 10 - 11/8
E = - 1/10 - 11/8
E = - 1 x 4 / 10 x 4 - 11 x 5 / 8 x 5
E = - 4/40 - 55/40
E = - 59/40