题干

已知函数y=x+
t
x
有如下性质:如果常数t>0,那么该函数在(0, t ]上是减函数,在[ t ,+∞)上是增函数.
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莱蒙托夫

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                                                                                             波涛在汹涌——海风在呼啸,

                                                                                             桅杆在弓起了腰轧轧地作响……

                                                                                             唉!它不是在寻求什么幸福,

                                                                                             也不是逃避幸福而奔向他方!


                                                                                            下面是比蓝天还清澄的碧波,

                                                                                            上面是金黄色的灿烂的阳光……

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                                                                                             仿佛是在风暴中才有着安详!