bài 9
d)
`1 5/27+(3x-7/9)^3=24/27`
`=> 32/27+(3x-7/9)^3=24/27`
`=>(3x-7/9)^3=24/27-32/27`
`=>(3x-7/9)^3=(-8)/27`
`=>3x-7/9=(-2)/3`
`=>3x=(-2)/3+7/9`
`=>3x=1/9`
`=>x=1/9:3`
`=>x=1/27`
bài 10
a)
`(x+1/5)^2=9`
`=>x+1/5=3`
`=>x=3-1/5`
`=>x=14/5`
b)
`22/9-(x+1/2)^2=7/3`
`=>(x+1/2)^2=22/9-7/3`
`=>(x+1/2)^2=1/9`
`=>x+1/2=1/3`
`=>x=1/3-1/2`
`=>x=-1/6`
c)
`(2x-1/3)^2+17/25=26/25`
`=>(2x-1/3)^2=26/25-17/25`
`=>(2x-1/3)^2=9/25`
`=>2x-1/3=3/5`
`=>2x=3/5+1/3`
`=>2x=14/15`
`=>x=14/15:2`
`=>x=7/15`
d)
`(1/2x+1/3)^3=8/27`
`=>1/2x+1/3=2/3`
`=>1/2x=2/3-1/3`
`=>1/2x=1/3`
`=>x=1/3:1/2`
`=>2/3`
