求数学建模解题过程程

求解答过程:我会想,我会填。 1_百度知道
1.秋天 2.冬天
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出门在外也不愁求解答过程:阅读理解。_百度知道
求解答过程:阅读理解。
阅读理解。
&&&& Education is not an end, but a means to an end. In other words, we do not educate children only for the purpose of educating them. Our purpose is to fit them for life. &&& &In some modern countries it has for some time been fashionable to think that by free education for all-one
can solve all the problems of society and build a perfect nation. But we can already see that free education for
we find in such countries a far larger number of people wi they refuse to do what they think “low” and, in fact, work with hands is thought to be dirty and shameful in such
countries. But we have only to think a moment to understand that the work of a completely uneducated farmer is far more important than we can live without education, but we die if we have no food. If no one cleaned our streets and took the rubbish away from our houses, we should get terrible diseases in our towns.
&&&& In fact, when we say that all of us must be educated to fit us for life, it means that we must be educated in such a way that, firstly, each of us can do whatever work suited to his brains and ability and, secondly, that
we can realize that all jobs are necessary to society, and that is very bad to be ashamed of one's work. Only
such a type of education can be considered valuable to society.
1. The writer of the passage thinks that _____.
A. education can settle most of the world's problems
B. free education for all probably leads to a perfect world C. free education won't help to solve problems
D. all the social problems can't be solved by education
2. The writer wants to prove that _____.
A. our society needs all kinds of jobs
B. our society needs free education for all
C. a farmer is more important than a professor D. work with hands is the most important
3. The purpose of education is _____.
A. to choose officials for the country B. to prepare children mainly for their future work
C. to let everyone receive education fit for him
D. to build a perfect world
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出门在外也不愁初中化学方程式计算 求高手 求解题过程_百度知道
50g由图象可知:完全反应后生成的二氧化碳的质量是2.2g;设13.3g样品中碳酸钠的质量是x ;Na2CO3+2HCl═2NaCl+H2O+CO2↑106
2.2g 106/x=44/2.2g 解得:x=5.3g 故样品中Na2CO3的质量是5.3g 设变质NaOH的质量是zCO2 + 2 NaOH = Na2CO3 + H2O·
5.380/106 = z/5.3解得z=4 g即变质NaOH的质量 = 4g样品中没有变质氢氧化钠的质量为13.3g-5.3g=8g;变质程度 = 4 / (4+8) = 33.3%设消耗HCl的质量是wNaOH+HCl═NaCl+H2O40
则40/8g=36.5/w解得:w=7.3 g盐酸的质量 = 7.3 ÷ 14.6% = 50 g
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与NaIH反应的HCl质量:8*36.5/40*14.6%=50g
na2co3+2hcl==2nacl+h2o+co2↑106
y=3.65gmNaOH=13.3-5.3=8gNaOH%=8/13.3=60.2%m已用盐酸=3.65/14.6%=25naoh+hcl==nacl+h2o 40
x=7.3m盐酸=7.3*14.6%=50g发现问题:根据上述数据可以,只要25g盐酸就能使变质部分完全反映,与图中反映情况不符
解:1.由图象可知:完全反应后生成的二氧化碳的质量是2.2g;
设13.3g样品中碳酸钠的质量是x ;
Na2CO3+2HCl═2NaCl+H2O+CO2↑
106/x=44/2.2g
解得:x=5.3g
故样品中Na2CO3的质量是5.3g
设变质NaOH的质量是y
CO2 + 2 NaOH = Na2CO3 + H2O
80/106 = y/5.3
即变质NaOH的质量 = 4g
样品中没有变质氢氧化钠的质量为13.3g-5.3g=8g;
变质程度 = 4 / (4+8) = 33.3%
2.解:设氢氧化钠消耗HCL的质量是a
NaOH+HCl═NaCl+H2O
则40/8g=36.5/a
解得:a=7.3 g
盐酸的质量 = 7.3 ÷ 14.6% = 50 g
3.根据上...
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出门在外也不愁求解答过程:近年来,绝大多数城乡_百度知道
求解答过程:近年来,绝大多数城乡
近年来,绝大多数城乡居民的电费、水费、手机费、管道煤气费、有线电视接收费都由银行代扣代缴。居民张某将300元钱打入中国建设银行的龙卡,由建行代缴电话费,当月没有用完,下个月银行在卡上打入0.28元利息。一个月后龙卡上透支了100元,银行代为缴纳了电话费,后来在张某补缴和预缴款中扣去了0.17元的利息。 根据以上材料,请回答: (1)该建行为什么要在张某的龙卡上打入0.28元利息?这笔利息是按哪种利率计算的? ______________________________________________________________________________________________________________________________________________________________________________ (2)被扣去的0.17元利息属于什么利息?为什么张某要支付这笔利息? ______________________________________________________________________________________________________________________________________________________________________________ (3)银行开办这类业务具有什么意义? __________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
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(1)张某存入龙卡的钱当月没有用完,余下的钱就等于在银行的存款储蓄,因此,银行必须对这笔余款支付利息。这笔余款不满3个月,因此银行是按活期储蓄的利率计算的。 (2)这属于贷款利息。张某龙卡上透支,银行代为缴纳电话费,就相当于张某贷款缴纳话费,因此张某必须按贷款利率支付这笔利息。 (3)银行开办这类业务,是为广大居民缴纳各种生活费用提供方便,也是为电信部门、供水部门、供电部门等收缴费用提供服务。就银行自身来讲,既能增加来自经营单位和居民的储蓄存款,又能从提供的服务中收取一定的手续费,从而增加银行的收入。
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出门在外也不愁求解答过程:阅读理解。_百度知道
求解答过程:阅读理解。
阅读理解。
&&&&&&&& Jackie Chan was born on Apirl 7, 1954, in Hongkong,China. His parents left mainland China for Hong
Kong a short time before he was born. His parents named him "Chang Kongsang", which means "born in Hong
Kong". They wanted to celebrate a safe trip to HongKong.
&&&&&&&& At first, Jackie's family lived in the French Embassy (大使馆). His father was a cook, and his mother a
housekeeper. When Jackie was seven years old, his family moved to Australia. His father got a job in the
American Embassy. Later, back in Hong Kong Jackie's father sent him to the China Drama Academy. Jackie studied and worked 19 hours a day. The students practised KungFu and learned how to do many stunts (特技 表演) there.
&&&&&&&& When Jackie was seventeen years old, he began to do dangerous stunts for films. In the early 1980s,
Jackie went to Hollywood, but he wasn't very successful. He went on to make films in HongKong and had
great success. Finally, in 1995, Jackie Chan has both Chinese and American fans ,and his films make millions
of dollars.
1. When did Jackie Chan's parents move to Hong Kong?
A. They moved to Hong Kong a short time after Jackie Chan was born.
B. They moved to Hong Kong a short time before Jackie Chan was born.
C. They moved to Hong Kong after they came back from America.
2. What did Jackie Chan learn in the China Drama Academy?
B. Dancing
C. Kong Fu and stunts
3. Which is true according to the passage?
A. Jackie Chan is about forty years old.
B. He wasn't very successful when he first went to Hollywood.
C. He became famous at the age of 17.
4. Which is true according to the passage?
A. Jackie Chan is about forty years old.
B. He wasn't very successful when he first went to Hollywood.
C. He became famous at the age of 17.
5. We can learn from the article that _____.
A. Jackie Chan's mother was also born in Hong Kong.
B. At first, Jackie's family lived in France.
C. the time when his family moved to Australia was around 1961.
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