Bonsoir,
a)
n+n+1+n+2 +n+3 = 46
4n + 6 = 46
4n = 46 -6 =40
n= 40/4 = 10
=>
10, 11, 12 ,13
b)
6x +12x = 90
18x = 90
x = 90/18 = 5
=>
6*5 = 30
12*5 = 60
c)
3n + 3(n +3) = 99
3n + 3n+9 = 99
6n+9 = 99
6n = 99-9 =90
n= 90/6 = 15
3n = 15*3 = 45
3n+9 = 3*5 +9 = 45 + 9 = 54
=> 45, 54
d)
n
n+2
n+4
=> 3n+6 = 102
3n = 102 -6 = 96
n= 96/3 = 32
=>
32,34, 36