回复：回复：I'm careless,410 not 411,but the inequolity is good.we can

来源: 于 2010-06-23 09:00:17 [旧帖] [给我悄悄话] 本文已被阅读：次

Nonsense,I'm not right ,I have to say something.if the question has be changed to at least 4 questions, how to do?
Using the inequolity ,we get x=(410-300)/2=55.