填空题设A，B为三阶相似矩阵，A的两个特征值为1，2，行列式|B|=4，则=______.

填空题设f(x)连续，则

填空题求．

填空题设函数u=f(x，y，z)有连续偏导数，且z=z(x，y)由方程xe x -ye y =ze z 所确定，则du=_____.

填空题已知A为n阶实对称阵，λi(i=1，2，…，n)为A的n个特征值，则实二次型时的最大值为______.

填空题设L是顺时针方向的椭圆，其周长为l，则______.

填空题对充分大的一切x，以下5个函数：100x，log10x100，e10x，，最大的是________．

填空题设α，β均为3维列向量，且满足α T β=5，则矩阵βα T 的特征值为___________．

填空题设3阶矩阵只有一个线性无关的特征向量，则t=________。

填空题极限=________．

填空题设f(x)连续，且则

填空题[A] Is that what the American viewing public is getting.'? Perhaps 10% of prime-time network programming is a happy combination of entertainment and enrichment. There used to be television-movies rich in human values,, but they have now become an endangered species. I find television too much concerned with what people have and too little concerned with who they are, very concerned with taking care of No. 1 and not at all concerned with sharing themselves with other people. All too often it tells us the half truth we wan! to hear rather than the whole truth we need to hear. [B] Why is television not more fully realizing its humanizing potential? Is the creative community at fault? Partially. But not primarily. I have lived and worked in that community for 32 years, as both priest and producer. As a group, these people have values. In fact, in Hollywood in recent months, audience enrichment has become their thing. A coalition of media companies has endowed the Humanists Prize so that it can recognize and celebrate those who accomplish it. [C] Every good story will not only captivate its viewers but also give them some insight into what it means to be a human being. By so doing, it can help them grow into the deeply centered, sovereignty free, joyously loving human being God made them to be. Meaning, freedom and love are the supreme human values. And this is the kind of human enrichment the American viewing public has a right to expect from those who make its entertainment. [D] The problem with American TV is not the lack of storytellers of conscience but the commercial system within which they have to operate. Television in the U.S. is a business. [n the past, the business side has been balanced by a commitment to public', service. But in recent years the fragmentation of the mass audience, huge interest payments and skyrocketing production costs have combined with the FCC's abdication of its responsibility to protect the common good to produce an ahnost total preoccupation with the bottom line. The networks are struggling to survive. And that, the statistics seem to indicate, is mindless, heartless, escapist fare. If we are dissatisfied with the moral content of what we are invited to watch, I think we should begin by examining our own consciences. When we tune in, are we ready to plunge into reality, so as to extract its meaning, or are we hoping to escape into a sedated world of illusion? And if church leaders want to elevate the quality of the country's entertainment, they should forget about boycotts, production codes and censorship. They should work at educating their people in media literacy and at mobilizing them to support quality shows in huge numbers. [E] It is not a question of entertainment or enrichment. These are complementary concerns and presuppose each other. The story that entertains without enriching is superficial and escapist. The story that enriches without entertaining is simply dull. The story that does both is a delight. [F] That is the only sure way to improve the moral content of America's entertainment. [G] Despite questions of the motivation behind them, the attacks by the President and the Vice President on the moral content of television entertainment have found an echo in the chambers of the American soul. Many who reject the messengers still accept the message. They do not like the moral tone of American TV. In our society only the human family surpasses television in its capacity to communicate values, provide role models, form consciences and motivate human behavior. Few educators, church leaders or politicians possess the moral influence of those who create the nation's entertainment. Order:[G]______→41.______→42.______→43. ______→44. ______→45.______→[F]