Rút gọn biểu thức

giải giúp mình vs 
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Bài 10: Rút gọn các biểu thức sau
¹) -5x (x-3) (2x + 4)-(x + 7)(x-3)+(5x-2) (3x+4)
+2) (4x-1)(3x + 1) - 5x² (x-3)-(x-4)(x-3)-7(x³ - 2x² + x−1)
3) 4x (x² - 2x + 3)-3x (x + 1)(x-2) + (-2x - 5)(x-7)- 4x(x²-x+1)
44) 5x² (x-7)-4x (x-2)(x+3)-(x - 5)(x+6) + (2x − 1) (x + 5)
(3x-7)(x+3)+5x(x²-2x-4)-x(4x - 5)(x-4) - (x + 2)(x+1)
6) -7x (2x² - 4x-5)-(x - 5)(-2x+3)+(3x-2)(x+4)-4x² (x-3)
7) (x-6)(3x - 1) - 2x²(x - 2) + x(x - 1)(2x + 3) - 5x(x² - 4x + 1)
5)
8) (8x-1) (2x - 3)-(-x + 7)(x-2) - 6x (x²-x + 3) + (x² − 3)(x −4)
9) (-3x+4)(x-2)-x(x² − 2)(-4x+1)+ (2x - 5)(x² - 4x)
10) (5x-2)(x+1)-3x (x²-x-3)-2x (x - 5)(x+4) + 5x (x² −7)
11)-3x² (x-4) + 2x(x-1)-2x + 3) - (x-9)-2x + 1) - 5(x - 1) (x + 2)
12) (-2x² +5)(x-6)-4x(x² - 7x + 2)-2x (x+3)(x − 2) - (x³ - x²)
13) (x²-3x)(-5x² + x)-x³ (x − 7) + 5x²(x − 2)(x − 4) − (x + 1) (x + 3)
14) (-x+4)(x-5)-7x(x² -5x + 2) + (-5x + 1)(x² −5) + 30
15) 3x (x-2)(x+2)-2x (x-3)(x-7)+(x-1)(x² - 2x + 2)
- 3)(x²-3x)-(4x-2)(-x² +1)-4x (x-7)(x+1)-(x²-x-1)
17) -7x (x + 2)(x − 3) + 5x (-2x² + x-4) + 3x (x² - 5x-7) - (x² - 5x)