Toán giải pt: x^2-4x+1/x+1 + 2 = -x^2-5x+1/2x+1 16/09/2021 By Ayla giải pt: x^2-4x+1/x+1 + 2 = -x^2-5x+1/2x+1
`(x^2-4x+1)/(x+1 + 2) = (-x^2-5x+1)/(2x+1)` `<=>(x^2-4x+1)(2x+1)=(-x^2-5x+1)(x+3)` `<=>2x^3-7x^2-2x+1=-x^3-3x^2-5x^2-15x+x+3` `<=>2x^3-7x^2-2x+1+x^3+8x^2+14x-3=0` `<=>3x^3+x^2+12x-2=0` `<=>x≈0,26` Vậy …. Trả lời
`(x^2-4x+1)/(x+1 + 2) = (-x^2-5x+1)/(2x+1)`
`<=>(x^2-4x+1)(2x+1)=(-x^2-5x+1)(x+3)`
`<=>2x^3-7x^2-2x+1=-x^3-3x^2-5x^2-15x+x+3`
`<=>2x^3-7x^2-2x+1+x^3+8x^2+14x-3=0`
`<=>3x^3+x^2+12x-2=0`
`<=>x≈0,26`
Vậy ….