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1、专业好文档 高等代数专题研究课程 作 业第四次作业：1. 停车场内有m辆不同的大卡车与n辆小轿车，停放在一排. 如果小轿车必须停放在一起，一共有多少种停放方法？ 2. 把4个相同的黑球和3个相同的白球摆成一排，有多少种不同摆法？3. 把10个儿童分成二组(每组5人)，每组围成一个圆圈，有多少种不同围法？4. 展开多项式(a+b+c+d+e+f)5并合并同类项，共有多少项？5. 某人从楼下到楼上要走11个台阶，每步可走一级或二级，问有多少种不同走法、6. 求证：7. 求证 8. n对夫妻在一起跳交际舞，问刚好有k对夫妻为舞伴的方法有多少种？9. 求不大于1000且能被5，7，11整除的自然数个数
2、. 10. 某校举行三个单项体育比赛，项目为百米，跳高和铅球. 已知参加百米、跳高和铅球的人数分别为125，124和130；参加百米和跳高两项的人数为5人，参加百米和铅球两项的人数为12，参加铅球和跳高两项的人数为14人；三项都参加的为5人. 求(1) 只参加百米比赛的有多少人？(2) 只参加两项比赛的有多少人？(3) 至少参加一项比赛的人数是多少？If 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 F
3、ifa vice-president Jeffrey Webb - also in London for the FAs celebrations - said he wanted to meet Ivory Coast international Toure to discuss his complaint.CSKA general director Roman Babaev says the matter has been exaggerated by the Ivorian and the British media.Blatter, 77, said: It has been deci
4、ded 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 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
5、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 racism 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 ta
6、skforce, is in London for the Football Associations 150th anniversary celebrations and will attend Citys Premier League match at Chelsea on Sunday.I am going 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 h
7、im first to find out what his experience was.Uefa hasopened disciplinary proceedings against CSKAfor the racist behaviour of their fans duringCitys 2-1 win.Michel Platini, president of European footballs governing body, has also ordered an immediate investigation into the referees actions.CSKA said
8、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 the disappointing news: Mission aborted.The supersonic descent could happen as early as Sunda.The weather plays an important role in this mission.
9、 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, with capsule attached, will move through the lower level of the atmosphere (the troposphere) where our day-to-day weather lives. It will climb hig
10、her 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 kilometers) and into the stratosphere. As he crosses the boundary layer (called the tropopause),e can expect a lot of turbulence.The balloon will slo
11、wly 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, the 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 th
12、e 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 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 b
13、egin 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 control, 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
14、-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 to 172 mph (277 kph). He will have a reserve parachute that will open automatically if he loses consciousness at mach speeds.Even if everything goes as planned, it wont. Baumgartner still will free fall at a speed that would cause you and me to pass out, and no parachute is guaranteed to work higher than 25,000 feet (7,620 meters).cause there
