I.Trắc nghiệm
`1.B`
`2.B`
`3.C`
`4.B`
`5.A`
`6.B`
`7.C`
`8.B`
II.Tự luận
Câu 1.
`a) (x+1)^2+(x-1)^2-2(x-1)(x+1)`
`=x^2+2x+1+x^2−2x+1−2x^2−2x+2x+2`
`=4`
`b)(x-1)^3-(x+x+1)(x-1)`
`=x^3−2x^2+x−x^2+2x−1−2x^2+2x−x+1`
`=x^3−5x^2+4x`