The unquestioned role of a student is to learn as much as possible through whatever means it takes to acquire knowledge. Teachers and professors are human beings and are therefore not perfect. No o
Just how far does the euro(欧元) have to fall before Europe actually becomes reasonable? Anyone traveling to the old continent from the U.S. in recent years has learned the hard way how expensive it
满足
,且在
上为增函数，且
，则不等式
的解集为 .
