What is "someone you can't live without"?
本文內容已被 [ zhenghueng ] 在 2010-09-28 08:04:20 編輯過。如有問題,請報告版主或論壇管理刪除.
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<0, for a quadratic equation given in the form of a*x*x + b*x + c = 0.
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• 回複:What is "someone you can't live without"? -ragnarok- ♂ (564 bytes) () 04/26/2010 postreply 15:20:32