Question

giúp em bài n vs ạ em xin chân thành cảm ơn

Answer 1

`B = x^15 - 7x^14 - x^14 + 7x^13 + ... - 7x^2 - x^2 + 7x + x - 5.`

`= x^14(x - 7) - x^13(x-7) + ... - 7x(x - 7) + x - 5`

`= (x-7)(x^14 - x^13 + ... + 7x) + x - 5`

`= (7-7)(A) + x - 5`

`= 7 - 5`

`= 2`.

Answer 2

Ta có:

`8=7+1=x+1`

`B=x^15 -8x^14 + 8x^13 + ... +8x-5`

`=x^15 - (x+1)x^14 + (x+1)x^13 + ...+(x+1)x-5`

`=x^15 - x^15 -x^14 + x^14+ x^13 + ...+x^2+x-5`

`=x-5`

`=7-5`

`=2`