填空题xarcsinxdx＝________．

填空题设函数f(x)=在(一∞，+∞)内连续，则c=________。

填空题设A=(a ij )是3阶非零矩阵，｜A｜为A的行列式，A ij 为a ij 的代数余子式．若a ij +A ij =0(i，j=1，2，3)，则｜A｜=______．

填空题Before you speak to any audience, you should learn as much about its members as possible. Only in that way can you best adapt the level of your language and the content of your talk to your listeners. 41. Speaking to someone you know well.__________ Where are you likely to speak? Certainly, in this class you'll give several talks, and since you know most, if not all, of the students, you should face no major problems in adapting your approach to them. Another speaking possibility exists in your workplace. A third speaking possibility exists in any organization (social, cultural, athletic, and so on) that you belong to. You may be asked to speak at the next meeting or at the annual banquet. Here again, you know the people involved, their background, their education level, and their attitudes, and that's a tremendous advantage for you. Since we're upbeat and positive in this course, we'll assume that you've given successful talks under all three circumstances, and with this course under your belt, you can do it again. Since good speakers are hard to find and word about them travels fast, suppose that one day you get an invitation to speak to an organization in which you don't know a soul. What do you do now? If you feel able to handle the topic you're asked to speak on, accept this rare challenge. Here's where audience analysis comes into play. Be sure to ask the person who invited you for information on the members, information that encompasses a broad spectrum, such as in the following areas. 42. How old are your listeners? 43. Sex composition of your listeners. 44. Interest in topic.__________ 45. Interests or hobbies of the listeners.__________ [A] If you're invited to speak to a women's or men's organization, you know the answer to this question at once. Quite often, however, audiences are mixed fairly evenly, although at times one sex may predominate. [B] Do members of your prospective audience spend evenings watching TV movies and drinking beer at a local tavern, or do they read the Harvard Classics and attend concerts of Beethoven and Mozart? Do they play bingo and 21, or do they pursue the questions the intriguing intricacies of contract bridge and chess? Answers to these questions can help you choose the most appropriate material and language for your audience. Your choices can be crucial in determining the success or failure of your presentation. [C] Are the members recent college graduates, senior citizens, or business executives in midcareer? Just remember, age exerts a powerful impact on people's attitudes, values and motivations. [D] For example, your department manager may ask you to explain and demonstrate a procedure to some fellow employee. Or she may select you to address your department on behalf of the local blood donor drive. In both speech situations—in class and on the job—you're familiar with your audience; you speak their language; you have things in common with them. [E] Are you aware of the educational background of your audience? How many of them have doctoral degrees, master degrees or bachelor degrees? This will decide what kind of language you should adopt and how much they can understand. [F] Are the members of the organization interested in the topic or are they required to attend regardless of their interest? If the latter is true, what types of material will most likely pique their curiosity?

填空题微分方程y'－xe－y+=0的通解为________．

填空题若在x=2处条件收敛，则此级数的收敛域为________．

填空题幂级数的收敛区间是________．

填空题设z=ex+y2+f(x+y)，且当y=0时，z=x3，则

填空题设Ω为曲面z=x2+y2和平面z=1围成的空间体，则Ω的形心z坐标

填空题设为可逆矩阵，且，若C=，则C-1=________．

填空题欧拉方程x 2 y''+xy'-4y=x 3 的通解为___．

填空题设的敛散性为________．