Réponse :
Explications étape par étape
Bonsoir
For each of these calculations, the same number
from the scale (-9 to +9) must go into both boxes.
a. 20 + [ ] = 6 x [ ]
20 + n = 6n
6n - n = 20
5n = 20
n = 20/5
n = 4
20 + 4 = 24
6 x 4 = 24
b. [ ] - 12 = 4 x [ ]
n - 12 = 4n
-12 = 4n - n
-12 = 3n
n = -12/3
n = -4
-4 - 12 = -16
4 x (-4) = -16
c. [ ] x 7 = - 16 - [ ]
7n = -16 - n
7n + n = -16
8n = -16
n = -16/8
n = (-2)
-2 x 7 = -14
-16 - (-2) = -16 + 2 = -14
d. [ ] - 24 = 4 x [ ]
n - 24 = 4n
-24 = 4n - n
-24 = 3n
n = -24/3
n = -8
-8 - 24 = -32
4 x (-8) = -32
