`a,(2x+1)^2-(4x+1)(x-2)=0`
`<=>4x^2+4x+1-4x^2+8x-x+2=0`
`<=>11x=-3`
`<=>x=-3/11`
`b,(x+7)(x-4)=2(x-4)`
`<=>x^2+3x-28-2x+8=0`
`<=>x^2+x-20=0`
`<=>(x-4)(x+5)=0`
`<=>x=4` hoặc `x=-5`
`c,(3x-1)^2=16`
`<=>3x-1=+-√16`
`<=>3x-1=+-4`
`<=>x=5/3` hoặc `x=-1`
`d,4x^2-3x-1=0`
`<=>x(4x+1)-(4x+1)=0`
`<=>x=-1/4` hoặc `x=1`
`e,(x+2)/(x-2)-(x-2)/(x+2)=-16/(4-x^2)` `Đkxđ: ...`
`=>(2+x)^2(2-x)-(x-2)^2(2-x)=-16(x-2)`
`<=>16x-8x^2-16x-32=0`
`<=>32x-8x^2-32=0`
`<=>(x-2)^2=0 `
`<=>x=2(l)`
`=>Pt` vô nghiệm.
