Rút gọn biểu thức: (4x – 1)3 - (4x − 3)(16x2 + 3).
Giải thích
(4x – 1)3 - (4x − 3)(16x2 + 3)
= 64x3 – 48x2 + 12x – 1 – (64x3 + 12x – 48x2 – 9)
= 64x3 – 48x2 + 12x – 1 – 64x3 – 12x + 48x2 + 9
= 8.
(4x – 1)3 - (4x − 3)(16x2 + 3)
= 64x3 – 48x2 + 12x – 1 – (64x3 + 12x – 48x2 – 9)
= 64x3 – 48x2 + 12x – 1 – 64x3 – 12x + 48x2 + 9
= 8.