Question

[Lê Thị Hải Khánh]

Giải hộ c10 vs ạ(hứa tick)

Answer 1

[Yeutoanhoc]

`A(x)=P(x)-Q(x)`

`=-5x+10+6x^3-6x^2+2x-(x^3-5x+5x^3+4-x^2)`

`=6x^3-6x^2-3x+10-(6x^3-x^2-5x+4)`

`=6x^3-6x^3-6x^2+x^2-3x+5x+10-4`

`=-5x^2+2x+6`

Đặt `A(x)=0`

`=>-5x^2+2x+6=0`

`=>5x^2-2x-6=0`

`=>x^2-2/5x-6/5=0`

`=>(x-1/5)^2=31/25`

`=>x=(+-sqrt{31}+1)/5`

Answer 2

[Phong Thần]

8 A

15 D