如何定量描述?For example, there are two real roots when b*b-4*a*c>0, while there are two complex roots when b*b-4*a*c
What is "someone you can't live without"?
本文内容已被 [ zhenghueng ] 在 2010-09-28 08:04:20 编辑过。如有问题,请报告版主或论坛管理删除.
所有跟帖:
• 回复:What is "someone you can't live without"? -ragnarok- ♂ (564 bytes) () 04/26/2010 postreply 15:20:32