Giải hộ e với ạaaaaa

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

2) \( x_1(x-y)^2 - (x^2 - y)(y + 1) \)
= \( x_1(x^2 - 2xy + y^2) - (x^2y + x^2) - (y + 1) \)
= \( x_1x^2 - 2x_1xy + x_1y^2 - x^2y - x^2 - y - 1 \)

3) \( (x-5)x^2 + 26 \cdot (5 - x)(1 - 5x) \)
= \( x^3 - 5x^2 + 130 - 26x + 5x^2 \)
= \( x^3 - 26x + 130 \)

4) \( (x - y^2 + y)(x - 1)(x + y) \)
= \( (x^2 - y^2) - (x^2 - y - x + 1) \)
= \( y^2 + y - (x - 1) \)

5) \( (3x - 2)(2x - 1) + (-5x - 1)(3x + 2) \)
= \( 6x^2 - 3x - 10x - 2 \)
= \( 6x^2 - 13x - 2 \)

6) \( (3x - 5)(2x + 11) - (2x - 3)(3x + 7) \)
= \( 6x^2 + 33x - 10x - 21 \)
= \( 6x^2 + 23x - 21 \)

7) \( (2x + 3)(x - 4) + (x - 5)(x - 2) \)
= \( 2x^2 - 8x + 3x - 12 + x^2 - 7x + 10 \)
= \( 3x^2 - 12x - 2 \)

8) \( (12x - 5)(4x - 1) + (3x - 7)(1 - 16x) \)
= \( 48x^2 - 12x - 5 + 3x - 48x^2 + 7 + 112x \)
= \( 103x - 5 \)