The Beijing Tianjin Intercity Railway will be put into operation on August 1, 2008. It is estimated that the one-way direct operation time of high-speed train between Beijing and Tianjin will be half an hour. In a test run, the running time of the test train from Beijing to Tianjin is 6 minutes longer than the expected time, and the travel time from Tianjin to Beijing is the same as the expected time The average driving speed is 40 kilometers per hour. What is the average speed from Beijing to Tianjin during the test run?

The average speed from Beijing to Tianjin is x km / h, and the average speed from Tianjin to Beijing is (x + 40) km / h
According to the meaning of the title: 30 + 6
60x＝1
2（x+40）
The solution is: x = 200
A: during the test run, the average speed from Beijing to Tianjin is 200 kilometers per hour

From January to September 2001, the average disposable income of urban residents in China was 5109 yuan, an increase of 8.3% over the same period of last month. How much was this income in the same period of last year?

5109÷（1+8.3%）
=5109÷108.3%
About 4717.45 yuan
A: the same period last year, the income was 4717.45 yuan

Exercise 4 on 109 pages of math book in junior high school

(1)1/6x+1/12x+1/7x+ 5+1/2x+4 =x
(2)
84×(1/6 + 1/12+ 1/70)+5=38
（3）84-4=80

Answers to questions 1 and 2 on Page 103 in the second volume of the seventh grade mathematics book

1(1) (3/2)x+2y=1
Both sides of the equation are the same * 2
3x+4y=2
4y=2-3x
y=（2-3x）/4
(2)(1/4)x+(7/4)y=2
Both sides of the equation are the same * 4
x+7y=8
y=（8-x）/7
（3）5x-3y=x+2y
4x=5y
y=4x/5
(4) 2(3y-3)=6x+4
3y-3=3x+2
3y=3x+5
y=(3x+5)/3
2(1)y=x+3 ①
7x+5y=9 ②
Replace Formula 1 with formula 2
7x+5（x+3）=9
7x+5x+15=9
12x=-6
x=-1/2
Y = - 1 / 2 + 3 = 5 / 2
∴x=-1/2;y=5/2
（2） 3s—t=5 ①
5s+2t=15 ②
T = 3s-5 ③
③ 5 S + 2 (3s-5) = 15
5s+6s-10=15
s=25/11
T = 3 * 25 / 11-5 = 20 / 11
∴s=25/11; t=20/11
（3）3x+4y=16 ①
5x-6y=33 ②
From the formula y = (16-3x) / 4 ③
Replace formula 3 with equation 2 5x-6 [(16-3x) / 4] = 33
5x-1.5(16-3x)=33
5x-24+4.5x=33
9.5x=57
X=6
(y = (3) / 1 6
∴x=6; y=-1/2
（4） 4〔x-y-1〕=3〔1-y〕-2 ①
x/2+y/3=2 ②
According to the same * 6 on both sides of equation 2
3x+2y=12
x=(12-2y)/3 ③
Replace formula 3 with formula 1
4[(12-2y)/3 -y-1]=3(1-y)-2
Both sides of the equation are the same * 3
4(12-2y)-12y-12=9-9y-6
48-8y-12y-12=3-9y
36-20y=3-9y
11y=33
Y=3
Substituting into formula 3, x = (12-2y) / 3
x=(12-2*3)/3=2
∴x=2;y=3

How to do the fifth problem of 102 in the first mathematics book of junior high school?

Solution B took X minutes
15X=10（X+30）
X=60
60 + 30 = 90 minutes
90 × 10 = 900m

English translation Lesson nine, unit two!

Lisa: Mom, there's a pet store there. Can we go in and have a look at the pets in the store?
Mum: of course
Lisa: Mom, look at that cat and her kittens
Mum: what lovely kittens! They are playing together! Their mother is sleeping
Lisa: look, mom, what are those? Are they dogs?
Mum: No, they are not. They are puppies. Their mother is a dog
Lisa: can they run?
Mum: Yes, they can run. Dogs can run
Is the last sentence OK

Ask for compulsory education curriculum standard for Grade 6 experimental textbook Chinese volume 2 new words! (there are 23 classes)

2. Steaming
3. The seedlings are withered and the yam is young
6. Ten days boiled garlic and vinegar dumplings, jade mixed hazel chestnut, Zheng, whip wheat Temple
Looking at the devil, the fat man and the cruel bandit's nest
12 hongdingwang drink
14 good skirt Pocket Coin ah cabinet
15 embroidered and rubbed with poison
18. Eleutheron is an effective agent for the analysis of alkaloids, but it is not well known for its fecal contribution
20 instruments against the field
That's it. That's all

Sixth grade second volume Chinese exercise book 55 pages compulsory education curriculum standard experimental textbook Chinese Publishing House 50 to 56 also answer urgent request!

After repeated discussions, we unanimously agreed with Wang Hui on behalf of Wang Hui

What is the fourth composition of the second volume of primary school "compulsory education curriculum standard experimental textbook Chinese (people's Education Press)" in giving some materials Be specific. Don't miss anything

Environmental protection refers to the conscious protection of natural resources and the rational use of them to prevent the natural environment from being polluted and damaged. Comprehensive treatment must be done to the polluted and damaged environment in order to create an environment suitable for human life and work

"Compulsory education curriculum standard experimental textbook" Chinese (sixth grade volume 1) directory! Please give me the catalogue of this book, in words Format: 1. Visiting friends in the mountains 2. Mountain rain 3. The tribe of grass insects 4. The wild of SUOXIYU Vocabulary review - reading, reading and writing Words check - reading and recording Oral communication · exercises Review and development accumulate over time It may be really troublesome, I'm accumulating points. I'll definitely add points Sorry, it's not like that. I've done it. It took me a whole day Thank you very much, really

Group 1: 1. Visiting friends in the mountain ············· 22 * mountain rain ··································································································································································