`#khanhly`

`1/3x+2/3(x-1)=0`

`=>1/3+2/3x-2/3=0`

`=>x-2/3=0`

`=>x=2/3`

Vậy `x=2/3`

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`(2x+1)/5=60%`

`=>(2x+1)/5=3/5`

`=>2x+1=3`

`=>2x=2`

`=>x=1`

Vậy `x=1`

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`(-0,6x-1/2) . 2=1/3`

`=>-0,6x-1/2=1/3 : 2`

`=>-0,6x-1/2=1/6`

`=>-0,6x=1/6+1/2`

`=>-0,6x=2/3`

`=>x=2/3 : (-0,6)`

`=>x=-10/9`

Vậy `x=-10/9`

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`(3x-1/2)^2-1/4=0`

`=>(3x-1/2)^2=1/4`

`th_1 : (3x-1/2)^2=(1/2)^2`

`=>3x-1/2=1/2`

`=>3x=1`

`=>x=1/3`

`th_2 : (3x-1/2)^2=(-1/2)^2`

`=>3x-1/2=-1/2`

`=>3x=0`

`=>x=0`

Vậy `x\in{1/3;0}`