`!`
`(x^3-3x^2):(x-3)`
`= x^2(x-3) :(x-3)`
`=x^2`
`----`
`(2x^2+2x-4):(x+2)`
`=2(x^2+x-2) :(x+2)`
`= 2 (x^2+2x-x-2) :(x+2)`
\(=2\left[x\left(x+2\right)-\left(x+2\right)\right]:\left(x+2\right)\)
`= 2(x+2)(x-1) :(x+2)`
`=2(x-1)`
`-------`
`(x^4-x-14):(x-2)`
https://hoc24.vn/cau-hoi/x4-x-14-x-2-giup-minh.204306769717
bn tham khảo ở đây nha
`----`
`(x^3-3x^2+x-3):(x-3)`
`= x^2(x-3) +(x-3) :(x-3)`
`=(x-3)(x^2+1):(x-3)`
`=x^2+1`