Sagot :
Bonjour !
28 = 3 x 7 + 7
4 (x -1) = 28 (on divise par 4 )
x-1 = 7
x = 7+1
x= 8
bonne continuation
J
28 = 3 x 7 + 7
4 (x -1) = 28 (on divise par 4 )
x-1 = 7
x = 7+1
x= 8
bonne continuation
J
Explications étape par étape:
a) 28 = 3a + 7
28 - 7 = 3a
21 = 3a
21 / 3 = a
7 = a
b) 4(x - 1) = 28
4x - 4 = 28
4x = 28 + 4
4x = 32
x = 32 / 4
x = 8