Question

已知0<x<=1/4，求函数f(x)=（x^2-2x+2）/x的最小值 求过程 谢谢

Answer 1

f(x)=x+2/x-2
则0<x<√2时，x+2/弯败x递减
所以最小值埋闷颤罩晌=f((1/4)=25/4

追问

请问f(x)=x+2/x-2
哪来的 ？

追答

x^2/x-2x/2+2/x

追问

请问f(x)=x+2/x-2
哪来的 ？

追答

拆开

Answer 2

f(x)=x+2/x-2
这是厅败对号链禅函数，棚伏尘在（0，√2】内单调递减
∴当x=1/4是取最小值f(1/4)=1/4+8-2=25/4
2/x是分数

Answer 3

f(x)=x+2/x-2
这是态郑芦对号函数，在（丛毕0，√2】内单调递减
∴当x=1/4是帆带取最小值f(1/4)=1/4+8-2=25/4

Answer 4

   热     ★★★【字体：小 大】说明:引用此文请注明出处,并务请保留后面的有效链接地址,谢谢！ http://www.nmet168.com/Article/201403/3545.html 2014年高考英语新课标全国卷语法填空样题  样题1  对尘吵答语篇型语法填空题的研究（短文体）第二节（共10小题，每小题1.5分，共15分）阅读下面材料，在空白处填入适当的内容（不多于三个单词）或括号内单词的正确形式。One of my father’s favorite ____61____ (say) as I was growing up was “Try it!” I couldn’t say I didn’t like something, ____62____ it might be, until after I tried it. Over the years I’ve come to realize how much of my success I owe to my ____63____ (accept) of those words as one of my values. My first job was just one I decided to  try for a  couple of years until I determined what I wanted to do as a career (职业). ____64____ (actual) I believed I would work for a few years, get ____65____ (marry), stay home and raise a family, so I didn’t think the job I took mattered that much. I couldn’t ____66____ more mistaken. I mastered the skills of that ____67____ (begin) level  position and I was given the opportunity (机会) to move up through the company into ____68____(differ) positions. I accepted each new opportunity with the thought. “Well, I’ll try it; ____69____ I don’t like it I can always go back to my ____70____ (early) position.” But I was with the same company for the past 28 years.参考答案：61. sayings  碰猛             62. whatever             63. acceptance           64. Actually65. married               66. have been           67. beginning            68. different69. if                        70. earlier 样题2  对语篇型语法派慧填空题的研究（对话体）第二节（共10小题，每小题1.5分，共15分）阅读下面材料，在空白处填入适当的内容（不多于三个单词）或括号内单词的正确形式。Mum (putting on her coat): I’m going to have to go down to the shop for more bread.Alan: Why?Mum: I’m not sure what ____61____ (happen). I made some sandwiches earlier and left them on the table ____62____ I went to answer the phone. But someone must have taken them because they’re ____63____ (go).Alan: Oh, it must have been Dad. I’m sure he was in the kitchen ____64____ (early).Mum: No, he went off to his tennis match before I finished ____65____ (make) them, so he couldn’t have done it, ____66____, he couldn’t carry a plate of sandwiches as well as all his tennis stuff, so I’m sure ____67____ wasn’t him.Alan (opening the fridge door): Well, it wasn’t me. But Mum, look! Are these your sandwiches here on the bottom shelf of ____68____ fridge?Mum: Are they there? Oh, my goodness. I ____69____ (put) them in there when the phone rang. Oh, dear. I really must be losing my ____70____. Now, why did I put on my coat? 参考答案：61. happened             62. when                   63. gone                   64. earlier65. making               66. Anyway / Besides 67. it                       68. the69. must have put      70. mind / memory