Rút gọn

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Bài 13: Rút gọn
1) -3x (x + 2)²(x+3)(x - 1)(x + 1) - (2x - 3)²
2) (x − 3)(x+3)(x + 2) - (x - 1)(x² -3) -5x (x + 4)² − (x − 5)²
3) 2x (x-4)²(x+5)(x-2)(x + 2) + 2(x + 5)² -(x-1)²
4) (x + 5)² - 4x (2x + 3)² - (2x - 1)(x+3)(x-3)
5)-2x (3x + 2) (3x - 2)+5(x + 2)²-(x-1)(2x-1)(2x + 1)
6) (7x-8)(7x + 8) 10(2x + 3)² + 5x(3x - 2)² - 4x(x - 5)²
7) (x²-3)(x²+3)-5x²(x + 1)² -(x²-3x)(x² - 2x) + 4x(x + 2)²