a. 219-7.(x.1)=100
7.x=219-100
7x=119
x=119:7
x=17
b.(3x-6).3=34
3x-6=34:3
3x-6=33
3x-6=27
3x=27+6
3x=33
x=33:3
x=11
c.3.2x=48
2x=48:3
2x=16
2x=24
x=4
d. 5.x2=180
x2=180:5
x2=36
x2=62
x=6
a)219-7.(x.1)=100
7.(x.1) =219-100
7.(x.1) =119
(x.1) =119:7
(x.1) =17
x =17.1
x 17
b)(3x-6).3=3^4
(3x-6).3=81
(3x-6) =81:3
(3x-6) =27
3x =27+6
3x =33
x =33:3
x =11
c)3.2^x=48
2^x=48:3
2^x=16
2^x=2^4
Suy ra x=4
d)5.x^2=180
x^2=180:5
x^2=36
x^2=6^2
Suy ra x=6