[代數] 幾個問題請教

[wuxr (wuxr)]

http://www.artofproblemsolving.com/Forum/viewtopic.php?f=61&t=468974


http://www.artofproblemsolving.com/Forum/viewtopic.php?f=61&t=468846

求教了  謝謝^^


--
※ 發信站: 批踢踢實業坊(ptt.cc) 
◆ From: 140.119.98.124