15、解.解 原方程可化为 ， （当） ， 两边积分得 ， 即为通解 。
当时 ， 即 ， 显然满足原方程 ， 所以原方程的全部解为及 。
(2) 解 当时 ， 原方程可化为 ， 令 ， 得 ， 原方程化为 ， 解之得；当时 ， 原方程可化为 ， 类似地可解得 。
综合上述 ， 有 。
(3) 解 由公式得。
三、求解下列各题1 计算下列行列式：（.2） ， 解：（3）解：3设矩阵A ， B满足矩阵方程AX B ， 其中 ，, 求X 解法一：先求矩阵A的逆矩阵因为所以 且 解法二： 因为 所以 4 设矩阵试计算A-1B解 因为 所以 且 2设.(1)若 ， 求；(2) 若 ， 求；(3) 若 ， 求.解：(1) P(B)=P(B)P(AB) 因为A ， B互斥 ， 故P(AB)=0 ， 而由已知P(B)= 。

16、 P(B)=P(B)=(2) P(A)= ， 由AB知：P(AB)=P(A)= P(B)=P(B)P(AB)=(3) P(AB)= P(B)=P(B)P(AB)=3假设有3箱同种型号零件 ， 里面分别装有50件 ， 30件和40件 ， 而一等品分别有20件 ， 12件及24件.现在任选一箱从中随机地先后各抽取一个零件（第一次取到的零件不放回） ， 试求先取出的零件是一等品的概率；并计算两次都取出一等品的概率.解：设B1、B2、B3分别表示选出的其中装有一等品为20 ， 12 ， 24件的箱子 ， A1、A2分别表示第一、二次选出的为一等品 ， 依题意 ， 有P(A1)=P(B1)P(|B1)+P(B2)P(A1|B2)+P(B3)P(A 。

17、1|B3)=0.467P()=0.220If we dont do that it will go on and go on. We have to stop it;
we need the courage to do it.His comments came hours after Fifa vice-president Jeffrey Webb - also in London for the FAs celebrations - said he wanted to meet Ivory Coast international Toure to discuss his complaint. 。

18、CSKA general director Roman Babaev says the matter has been exaggerated by the Ivorian and the British media.Blatter, 77, said: It has been decided by the Fifa congress that it is a nonsense for racism to be dealt with with fines. You can always find money from somebody to pay them.It is a nonsense。

19、to have matches played without spectators because it is against the spirit of football and against the visiting team. It is all nonsense.We can do something better to fight racism and discrimination.This is one of the villains we have today in our game. But it is only with harsh sanctions that racis 。

20、m and discrimination can be washed out of football.The (lack of) air up there Watch mCayman Islands-based Webb, the head of Fifas anti-racism taskforce, is in London for the Football Associations 150th anniversary celebrations and will attend Citys Premier League match at Chelsea on Sunday.I am goin 。

21、g to be at the match tomorrow and I have asked to meet Yaya Toure, he told BBC Sport.For me its about how he felt and I would like to speak to him first to find out what his experience was.Uefa hasopened disciplinary proceedings against CSKAfor the racist behaviour of their fans duringCitys 2-1 win. 。

22、Michel Platini, president of European footballs governing body, has also ordered an immediate investigation into the referees actions.CSKA said they were surprised and disappointed by Toures complaint. In a statement the Russian side added: We found no racist insults from fans of CSKA.Baumgartner th 。

23、e disappointing news: Mission aborted.The supersonic descent could happen as early as Sunda.The weather plays an important role in this mission. Starting at the ground, conditions have to be very calm - winds less than 2 mph, with no precipitation or humidity and limited cloud cover. The balloon, wi 。

24、th capsule attached, will move through the lower level of the atmosphere (the troposphere) where our day-to-day weather lives. It will climb higher than the tip of Mount Everest (5.5 miles/8.85 kilometers), drifting even higher than the cruising altitude of commercial airliners (5.6 miles/9.17 kilom 。

25、eters) and into the stratosphere. As he crosses the boundary layer (called the tropopause),e can expect a lot of turbulence.The balloon will slowly drift to the edge of space at 120,000 feet (Then, I would assume, he will slowly step out onto something resembling an Olympic diving platform.Below, th 。

26、e Earth becomes the concrete bottom of a swimming pool that he wants to land on, but not too hard. Still, hell be traveling fast, so despite the distance, it will not be like diving into the deep end of a pool. It will be like he is diving into the shallow end.Skydiver preps for the big jumpWhen he。

27、jumps, he is expected to reach the speed of sound - 690 mph (1,110 kph) - in less than 40 seconds. Like hitting the top of the water, he will begin to slow as he approaches the more dense air closer to Earth. But this will not be enough to stop him completely.If he goes too fast or spins out of cont 。

28、rol, he has a stabilization parachute that can be deployed to slow him down. His team hopes its not needed. Instead, he plans to deploy his 270-square-foot (25-square-meter) main chute at an altitude of around 5,000 feet (1,524 meters).In order to deploy this chute successfully, he will have to slow 。

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标题：高等数学|电大专科《高等数学》复习题集及答案小抄( 三 )