Question

rút gọn các biểu thức sau:

Answer 1

1: =x^3-6x^2+12x-8+x^3+6x^2+12x-8

=2x^3+24x

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

=-6x^2-2

3: =1-3x+3x^2-x^3+x^3+9x^2+27x+27

=24x+12x^2+28

4: =x^3+6x^2y+12xy^2+8y^3-x^3+6x^2y-12xy^2+8y^3

=12x^2y+16y^3

5: =y^3-3y^2x+3yx^2-x^3-8x^3+12x^2y-6xy^2+y^3

=2y^3-9xy^2+15x^2y-9x^3

7: =8x^3-36x^2+54x-27-2x(4x^2+4x+1)

=8x^3-36x^2+54x-27-8x^3-8x^2-2x

=-44x^2+52x-27

8: =27x^3-27x^2+9x-1-27x^3-27x^2

=-54x^2+9x-1