已知{an}是各项为正数的等比数列,且a1a3+2a2a4+a3a5=100,4

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问题:

已知{an}是各项为正数的等比数列,且a1a3+2a2a4+a3a5=100,4是a2和a4的一个等比中项.

(1)求数列{an}的通项公式;

(2)若{an}的公比q∈(0,1),设bn=an•log2an,求数列{bn}的前n项和Sn

考点:等比数列的通项公式数列求和的其他方法(倒序相加,错位相减,裂项相加等)
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2005年4月6日,江昌公司与省农贸公司签订了进口尿素的购销合同,合同约定:江昌公司向农贸公司提供进口尿素3万吨,每吨单价700元,交货时间为同年6月初,在4月底农贸公司应付百分之十的款项,交货地点在省灵东码头。合同还对尿素的质量、包装、给付货款期限等违约责任等做了规定。合同签订后,江昌公司于5月2日向农贸公司提出按合同约定预付货款的要求,但农贸公司迟迟未付。后来因江昌公司货源落空,无法履行合同,双方发生纠纷。农贸公司于2005年7月30日向人民法院提出诉讼,要求江昌公司履行合同,赔偿经济损失并承担逾期交货的违约金。江昌公司则辩称,本合同属无效合同,其不负任何违约责任。人民法院经过审理判决:合同有效,江昌公司未按照合同履行义务,属于违约行为,应当支付给农贸公司违约金50万元,案件受理费2万元由江昌公司全部承担。江昌公司不服,提出上诉,称一审判决在事实的认定上有错误,要求确认合同无效。二审法院经过审理,认为合同有效,上诉人没有按合同约定供货应承担违约责任,但被上诉人没有按合同预付款项向人民法院要求赔偿经济损失,也应当承担一定的责任。故依法改判为各自承担自己的经济损失,一、二审诉讼费由双方分担。
  问题:

如果二审法院查明由于泊顺进出口公司的违约直接导致江昌公司的履行不能,遂追加泊顺进出口公司为第三人,并判决泊顺进出口公司承担责任。请问二审法院的做法是否妥当为什么

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Legend has it that an apple which fell from its branches was the inspiration for Sir Isaac Newton’s discovery of gravity(引力). But now history’s famous fruit tree is paying the price of fame.                            

The thousands of visitors drawn to Sir Isaac’s childhood home each year could be damaging the tree. A willow barrier(围栏)has been put around the tree. It means visitors to the 17th century Woolsthorpe Manor, near Grantham, Lincolnshire, will no longer be able to sit under its branches as Newton was said to have been doing in 1665 when “the notion of gravitation came to mind.”

The National Trust, which owns the small manor(庄园)where Newton was born in 1642, said the 2ft-high barrier was designed to preserve the tree. Official Ann Moynihan said there had been no damage so far but warned that there could soon be a problem.“Visitor numbers have gone up by around 50 percent, to 33,000 a year in three years. The more people who visit, the more the earth will become compacted(压实) around the tree and over the roots. We just want to preserve the tree for another 400 years if we can.”She said visitors will still be able to take apples from the tree.

Visitor Chris Gwyther,37,said,“I suppose it is a pity that you can’t sit under the tree like Newton. But you can still see it and the tree is 400 years old, it needs saving for the future.”

Newton left no information saying he had been inspired by a falling apple. The story appeared in a book by French philosopher Voltaire published in 1727, the year Newton died at the age of 84.

小题1:Why do people go to Woolsthorpe Manor to see the apple tree?

A.Because of the story about the apple tree.

B.Because of the long history of the apple tree.

C.Because of the sweetness of the apple.

D.Because of the unusual flower of the apple tree.小题2:What is the reason that people can’t sit under the tree like Newton?

A.The manor is too crowded to sit around.

B.Their heads will be hit by the apples.

C.A willow barrier has been put around the tree.

D.There is something wrong with the apple tree.小题3:The underlined word preserve means “_____”.

A.keep something safe

B.make something grow

C.leave something as it is

D.let something be小题4:When did Newton have the inspiration for the discovery of gravity?

A.In 1642.

B.In 1665.

C.In 1820.

D.In 1727. 小题5:Which of the following sentences is true?

A.Newton himself wrote a letter about the story of the apple tree.

B.Newton’s family owes Woolsthorpe Manor and tells the story.

C.Visitor numbers have gone up to 32,000 every year.

D.A French philosopher wrote the apple tree story in a book.

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6月龄京巴犬,已正常免疫。活泼,饮食正常。2d前曾被车撞伤。左腹侧部出现一拳头大肿胀,患部皮肤温度正常,按压无疼痛。最简单有效的临诊鉴别诊断方法是()

A.X线检查

B.B超检查

C.穿刺检查

D.血常规检查

E.血液生化检查

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用高强度等级水泥配制低强度混凝土时,为保证工程的技术经济要求,宜采用的措施是( )。

A.(A) 掺混合材料

B.(B) 减少砂率

C.(C) 增大粗骨料粒径

D.(D) 增加砂率

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引起昏迷的全身性病变有()

A.脑出血

B.伤寒

C.乙脑

D.一氧化碳中毒

E.败血症

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