Chen, Li and Wang teach Chinese, mathematics, ideological and moral education, physical education, music and fine arts in class 51. They teach two courses each Now we know: Sipin teacher and math teacher are neighbors; Mr. Li is the youngest; Mr. Chen likes to talk with PE teacher and math teacher; PE teachers are older than Chinese teachers; Miss Li, music teacher and Chinese teacher often go swimming together Can you analyze which two courses each teacher teaches?

Chen, Li and Wang teach Chinese, mathematics, ideological and moral education, physical education, music and fine arts in class 51. They teach two courses each Now we know: Sipin teacher and math teacher are neighbors; Mr. Li is the youngest; Mr. Chen likes to talk with PE teacher and math teacher; PE teachers are older than Chinese teachers; Miss Li, music teacher and Chinese teacher often go swimming together Can you analyze which two courses each teacher teaches?

A, B and C are teachers of Chinese, mathematics, foreign language, music, physical education and fine arts in class 1 of grade 6. Each teacher teaches two courses
(1) A foreign language teacher and a math teacher are neighbors
(2) B youngest
(3) A like to communicate with PE teachers and math teachers
(4) PE teachers are older than Chinese teachers
(5) B. music teacher and Chinese teacher often go swimming together
Please judge which two courses a, B, C, three teachers hand in
Residence: drawing tables

According to (2) (4), B is not a PE teacher, according to (3), a is not a PE teacher, so C is a PE teacher. According to (4), C is a PE teacher, not a Chinese teacher, according to (5), B is not a Chinese teacher

In order to help Yushu earthquake stricken areas rebuild their homes, a school called on teachers and students to donate voluntarily. The total amount of the first donation was 20 & nbsp; 000 yuan, and the total amount of the second donation was 56 & nbsp; 000 yuan. It is known that the number of the second donation was twice that of the first one, and the per capita donation was 20 yuan more than the first one?

Suppose the number of people who donate for the first time is x, from the meaning of the question: 560002x − 20000x = 20, the solution is x = 400. After testing, x = 400 is the solution of the equation. Answer: the number of people who donate for the first time is 400

Shop promotion, every 3 bottles of coke, 3 empty bottles can be used for a bottle of coke. Now drink 168 bottles, at least buy
Please explain,

This is 112 bottles. In fact, if you buy two, you get one free. First, divide 168 into three parts, and each part is 56. Then you have to buy two and get 112 bottles

What is the power of minus 2

The power of minus 2 is equal to the power of 2

The distance between a and B is 400 km. Both passenger and freight cars are driven from a to B. the passenger cars arrive in 5 hours and the freight cars arrive in 8 hours
(1) Time ratio of passenger car and freight car. (2) speed ratio of passenger car and freight car

1. Bus time: Truck time = 5:8
2. Bus speed: truck speed = 1 / 5:1 / 8 = 8:5

A ^ 2 + a = 0 (a is not equal to 0), find a ^ 2005 + A ^ 2004 + 12
What's the value?

a(a+1)=0 a=-1 a^2005+a^2004+12=-1=1=12=12

The distance between a and B is 360km. The local train runs 80km per hour. The speed ratio of the fast train to the local train is 5:4?

Express = 80 * (5 / 4) = 100km / h
360/（100+80）=2h
We met in two hours

X / 3 2 = 2x / 7 6

Is the title (x / 3) ＾ 2 = (2x / 7) ＾ 6
Yes, please ask me if you don't understand
First x = 0 holds
If x is not equal to 0, 1 / 9 = (2 / 7) ＾ 6 * x ＾ 4
X = 7 * radical 42 / 12

Two cars a and B leave from two places 600 kilometers apart at the same time, and they meet at 4 hours. It is known that the speed of car a is 1.5 times that of car B?

Vehicle B's speed x vehicle a's speed 1.5x
600/(1.5x+x)=4
x=60
The speed of car B is 60 and that of car a is 90
A car line 90 * 4 = 360 km
B car line 60 * 4 = 240 km