Aidez moi svp !!! je suis en 4 eme et je n arrive pas a faire l exercice de math voici la question : For each of these calculations, the same number from the

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