Bài 3: Rút gọn các biểu thức sau a) (2x - 3)(x + 2) - (4x - 2)(x - 5) b) (6x - 1)(3 + x) + (2x + 5)(-3x) c) 5x(x - 1) - (x + 2)(5x - 7) d) (x - 3)(2x - 1) - (x - 7)(2x - 1) e) 3x(2x - 8) + (6x - 2)(5 - x) f) (5x² - 2x + 1)(x - 2) - 3x(x + 1) + 7 g) (3x - 1)(3x + 5) - 7(x² + 2) h) (7x³ - 2x²) : (-2x²) + (5/4)x² - 3x : -1/2(x - 1)(2x + 1)

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Bài 3: Rút gọn các biểu thức sau
a) (2x - 3)(x + 2) - (4x - 2)(x - 5)
b) (6x - 1)(3 + x) + (2x + 5)(-3x)
c) 5x(x - 1) - (x + 2)(5x - 7)
d) (x - 3)(2x - 1) - (x - 7)(2x - 1)
e) 3x(2x - 8) + (6x - 2)(5 - x)
f) (5x² - 2x + 1)(x - 2) - 3x(x + 1) + 7
g) (3x - 1)(3x + 5) - 7(x² + 2)
h) (7x³ - 2x²) : (-2x²) + (5/4)x² - 3x : -1/2(x - 1)(2x + 1)