29×18表示______或______.49÷25表示______.

题型:填空题

问题:

2
9
×18表示______或______.
4
9
÷
2
5
表示______.
考点:分数乘法的意义和分数乘法的计算法则
题型:填空题

阅读理解。

     This story is about a young man. He worked very hard at his lessons. He was too busy to have a

rest. At last, he couldn't go to sleep. Every night, when he went to bed, he closed his eyes and tried to

sleep. But the more he tried, the more he stayed awake. After a while he decided to visit the doctor.

"I just can't go to sleep at night. What should I do?" "I have a suggestion," said the doctor. "Try counting

numbers. By the time you reach one thousand, you'll be asleep. I am sure of it." The nest day the man

reached to the doctor's office. "Well," said the doctor, "how are you today? Did you try my suggestion?"

The man still looked tired. "Yes," he said, "I tried counting one, two, three…

1. The young man couldn't go to sleep because _______.

A. he hadn't finished doing his lessons.

B. he had worked too hard and became ill.

C. he was worked about his homework

D. there was a lot of noise there and he couldn't have a good rest.

2. The doctor asked the young man _______.

A. to count numbers before he went to bed

B. to put all numbers from 1 to 1000 together

C. to count numbers while he was lying in bed

D. to take some medicine and go to earlier.

3. The young man returned to the doctor's office the next day because _______.

A. he wanted to thank the doctor

B. he was better and wanted some more medicine

C. he wanted to ask the doctor how to count the numbers

D. he still couldn't go to sleep at night

4. The young man _______.

A. counted from 569 to 1000

B. counted from 1 to 569 and fell asleep

C. counted from 1 to 569 and got up to drink some tea

D. counted from 1 to 1000 and fell asleep

5. The young man in fact _______.

A. didn't understand the doctor's suggestion

B. was not able to count numbers

C. didn't try the doctor's suggestion

D. wasn't ill at all  

题型:填空题
已知函数f(x)=
ax2+1
x+c
(a>0,c∈R)为奇函数,当x>0时,f(x)的最小值为2.
(I)求函数的解析式
(Ⅱ)若a+b=1,a、b∈R+,求证:f(a)f(b)≥
25
4

(Ⅲ) 若g(x)=f(x)-x,n∈N*且n≥2,求证:
n-1
2n
≤g(22)+g(32)+g(42)+…+g(n2)<
n-1
n
题型:填空题

2012年10月10日,美国商务部最终判决,认为中国的太阳能板和电池产品对美国构成了倾销,对从中国进口太阳能板与太阳能电池产品征收34%至47%的关税。对此我国企业要

①时调整发展战略,降低生产成本,扩大企业规模 

②走市场多元化和以质取胜之路 

③有规则意识和利用世贸组织规则的本领 

④尽快建立反倾销预警机制,反对和抵制各种形式的贸易保护主义

A.②③

B.①②

C.①③

D.②④

题型:填空题

下图表示的地貌分布在我国________地区,它是在________作用下形成的。

题型:填空题

严格遵守汽车使用与维护保养制度是减小机件磨损,()汽车大修间隔里程和使用寿命的重要措施。

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