Bài `1:`
`a, (x-3/4)^2=0`
`=> (x-3/4)^2=0^2`
`=> x-3/4=0`
`=> x=0+3/4`
`=> x=3/4`
Vậy `x=3/4`
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`b, (x-3)^2=1`
`=> (x-3)^2=1^2`
`=> x-3=1` hoặc `x-3=-1`
`=> x=1+3` hoặc `x=(-1)+3`
`=> x=4` hoặc `x=2`
Vậy `x in {2;4}`
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`c, (2x-1)^3=-8`
`=> (2x-1)^3=(-2)^3`
`=> 2x-1=-2`
`=> 2x=(-2)+1`
`=> 2x=-1`
`=> x=(-1):2`
`=> x=(-1)/2`
Vậy `x=(-1)/2`
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`d, (x-1/4)^2=1/4`
`=> (x-1/4)^2=(1/2)^2`
`=> x-1/4=1/2` hoặc `x-1/4=(-1)/2`
`=> x=1/2+1/4` hoặc `x=(-1)/2+1/4`
`=> x=2/4+1/4` hoặc `x=(-2)/4+1/4`
`=> x=3/4` hoặc `x=(-1)/4`
Vậy `x in {3/4;(-1)/4}`
