哈哈哈,我被快了兩步添~
搬到意見欄啦~
2014-04-06 17:25:22 補充:
我的答案在此:
https://s.yimg.com/rk/HA00430218/o/527273871.png
2014-04-06 17:35:31 補充:
169.
First note that x³ + 5x² + 2x - 8 = (x - 1)(x + 2)(x + 4)
2x³ + 9x² + 4x - 15 = (2x + 5)(x - 1)(x + 3)
x(x² - 16) (x - 1)(x + 2)(x + 4)
------ ÷ ----------
(2x + 5)(x - 4) (2x + 5)(x - 1)(x + 3)
2014-04-06 17:37:13 補充:
x(x + 4)(x - 4) (x + 2)(x + 4)
------ ÷ -------
(2x + 5)(x - 4) (2x + 5)(x + 3)
x(x + 4)(x - 4) (2x + 5)(x + 3)
------ × -------
(2x + 5)(x - 4) (x + 2)(x + 4)
x(x + 3)
----
(x + 2)