황민현 | Chat Online
02/10/2018 15:56:13

Rút gọn: (x + 1)(x^2 - x - 1) - (x - 1)(x^2 + x + 1); (2x + 3)(2x - 3) - (2x + 1)^2


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