Question

Answer 1

Bài 1

a

\(=2x^3+x\)

b

\(=5x^5-x^3-\dfrac{1}{2}x^2\)

c

\(=-3x^4y^2+6x^3y^2\)

d

\(=2a^3x^3+3a^2bx^2-2a^2cx\)

e

\(=6x^2-2x-6x^2-6x+3+8x\\ =3\)

Answer 2

2:

a: =x^3+x^2y-x^2y+y^3=x^3+y^3=1+1000=1001

b: =>\(x^3-x^2+x-x^3-x^2+m-5=-2x^2+x\)

=>m-2x^2+x-5=-2x^2+x

=>m=5

c: M=0

=>12x^2+8x-12x^2-30x+21x-21=0

=>-x-21=0

=>x=-21

d: x=2021 nên x+1=2022

x^4-2022x^3+2022x^2-2022x+2022

=x^4-x^3(x+1)+x^2(x+1)-x(x+1)+x+1

=x^4-x^4-x^3+x^3+x^2-x^2-x+x+1

=1