@Bơ
Đáp án:
a.
`P(x)=-2x^3 -2x^2+6x-2`
`Q(x)=x^3-2x+1`
b.
`P(x)+Q(x)=-x^3-2x^2+4x-1`
`P(x)-Q(x)=-3x^3-2x^2+8x-3`
Giải thích các bước giải:
a.`P(x) = -5x ² + x -2x ³+3x ²+5x-2`
`P(x)=-2x^3 -5x^2 +3x^2 +x+5x-2`
`P(x)=-2x^3 -2x^2+6x-2`
`Q(x)=-3x-5x ³+x+1+6x ³`
`Q(x)=-5x^3+6x^3 -3x+x+1`
`Q(x)=x^3-2x+1`
b.
`P(x)+Q(x)=(-2x^3 -2x^2+6x-2)+(x^3-2x+1)`
`P(x)+Q(x)=-2x^3-2x^2+6x-2+x^3-2x+1`
`P(x)+Q(x)=-2x^3+x^3-2x^2+6x-2x-2+1`
`P(x)+Q(x)=-x^3-2x^2+4x-1`
c.
`P(x)-Q(x)=(-2x^3 -2x^2+6x-2)-(x^3-2x+1)`
`P(x)-Q(x)=-2x^3-2x^2+6x-2-x^3+2x-1`
`P(x)-Q(x)=-2x^3 -x^3 -2x^2+6x+2x-2-1`
`P(x)-Q(x)=-3x^3-2x^2+8x-3`
