Sagot :
Bonsoir
2
2-7 = -5
-5-8 = -13
13 x -5 = 65
65-75 = -10
-3
-3-7 = -10
-10-8 = -18
-18 x -5 = 90
90-75 = 15
[(n-7-8)]x- 5 -75
= (n-15)x -5-75
= -5n +75-75
= 5n
-5n= -750
n = 150
Vérification si n = 150
150
150 -7 = 143
143-8 = 135
135 x -5 = -675
-675-75 = 750
2
2-7 = -5
-5-8 = -13
13 x -5 = 65
65-75 = -10
-3
-3-7 = -10
-10-8 = -18
-18 x -5 = 90
90-75 = 15
[(n-7-8)]x- 5 -75
= (n-15)x -5-75
= -5n +75-75
= 5n
-5n= -750
n = 150
Vérification si n = 150
150
150 -7 = 143
143-8 = 135
135 x -5 = -675
-675-75 = 750