已知函数f(x)=(2x2-4ax)lnx+x2(a>0). (1)求函数f(x 发布时间:2017-05-13 16:24 │ 来源:www.tikuol.com 题型:解答题 问题: 已知函数f(x)=(2x2-4ax)lnx+x2(a>0).(1)求函数f(x)的单调区间;(2)对∀x∈[1,+∞),不等式(2x-4a)lnx>-x恒成立,求a的取值范围.
题型:解答题 阅读短文,选择合适的词填空:home parents look English likeDear Sam and Jim, My name is Jay. I'm an 1_______ boy. I'm twelve years old. My 2_______ is in London but now I'm in Beijing with my 3_______. I want some English or American friends. Are you Americans? I'm a student in Beijing No. 1 Middle School. I'm in Class Four. My classmates (同学) are all Chinese. They love me and 4_______after me. My English teacher is Miss Wang. She's very young. She's a nice girl. I 5_______ her very much. Yours, Jay 查看答案
题型:解答题 患者女,45岁,因腹泻伴乏力、消瘦2个月就诊。患者发病前曾在委内瑞拉工作2年,近期出现腹泻,每日排成形软便10余次,量大伴酸臭味,同时伴有舌炎,乏力和消瘦明显,近2个月体重下降7kg。不伴有食欲减退、血便、发热、腹痛等症状。血常规检查提示:大细胞性贫血,天冬氨酸转移酶187U/L,碱性磷酸酶289U/L。血清叶酸2.8ng/ml(正常>4ng/ml),维生素B1296ng/L(正常>170ng/L),血清铁蛋白和铁含量正常。粪脂含量增高,隐血试验阴性。为了确诊,下一步首先进行()。(提示:多次粪镜检未见原虫和蠕虫,结肠镜未见异常。胃镜提示:轻度萎缩性胃炎和十二指肠球炎。)A.小肠黏膜活检B.胃黏膜活检C.小肠内容物抽吸行细菌培养D.维生素B12吸收试验E.抗麦胶蛋白抗体检测 查看答案