- Nov 11 Wed 2009 02:17
長除法求係數與因式分解
- Nov 11 Wed 2009 01:43
直角三角形, 邊長成等差, 必為3:4:5
- Nov 10 Tue 2009 23:05
Geometic Sequences
Geometic Sequences
the infinite sum of a geometric squence is 4. And the infinite sum of the cubes of its terms is equal to 192. Find the first term and the common ratio.
- Nov 10 Tue 2009 20:47
開關燈問題
一百盞燈分別標上號碼1、2、3、4、…、100,第一個人把每盞燈的拉線開關各拉一下,使得每一盞燈都亮了。第二個人把標號是2的倍數的燈的開關各拉一下,依此類推,直到第一百個人把標號為100的燈的開關拉一下,請問下列哪一盞燈是開著的?
(A) 24 (B) 36 (C) 48 (D)56
(A) 24 (B) 36 (C) 48 (D)56
- Nov 10 Tue 2009 19:52
10進位與2進位互換