Réponses

2014-10-30T12:28:52+01:00
78 -14= 64
64/2 = 32

32 + 14 = 46
tu as 32 et 46
46 + 32 = 78
2014-10-30T12:29:14+01:00
Bonjour

tu appelles tes nombres a et b

a + b = 78
a - b = 14

a = 78 -b

(78 - b) - b = 14
78 - 14 =  b + b
64 = 2 b
b = 32

a +32 = 78
a = 78 -32
a = 46

a + b = 78
46 + 32 = 78

a - b = 14
46 - 32 = 14