a) 4x + 36 = 100
4x = 100 - 36
4x = 64
x = 64 : 4
x = 16
b) 8x - 24 = 72
8x = 72 - 24
8x = 48
x = 48 : 8
x = 6
c) 15 - 3 . ( x + 1 ) = 6
3 . ( x + 1 ) = 15 - 6
3 . ( x + 1 ) = 9
x + 1 = 9 : 3
x + 1 = 3
x = 3 - 1
x = 2
a)4x + 36 = 100
<=> 4x = 100 - 36
<=> 4x = 64
<=> x= 64:4
<=> x=16
vậy x = 16
b) 8x - 24 = 72
<=> 8x = 72 + 24
<=> 8x = 96
<=> x = 96:8
<=>x=12
vậy x = 12
c) 15 - 3 . ( x+1 ) = 6
<=> 3.(x+1)=15-6
<=> 3.(x+1)=9
<=>x+1=9:3
<=>x+1=3
<=>x=2
vậy x=2
~Hok tốt~