3(3x -1/2)^3+1/9=0
<=>3(3x -1/2)^3=-1/9
<=>(3x -1/2)^3=-1/27
<=>3x -1/2=-1/3
<=>3x=1/6<=>x=1/18
Giải:
3.(3x-1/2)3+1/9=0
3.(3x-1/2)3 =0-1/9
3.(3x-1/2)3 =-1/9
(3x-1/2)3 =-1/9:3
(3x-1/2)3 =-1/27
(3x-1/2)3 =(-1/3)3
⇒3x-1/2=-1/3
3x =-1/3+1/2
3x =1/6
x =1/6:3
x =1/18
Chúc bạn học tốt!