Help to do two math problems Be sure to follow the method of the first year of junior high school in

x-1 y=3, so: y-x=3xy

2x-14xy-2y)/（x-2xy-y)（-2*3xy-14xy）/(-3xy-2xy)（-20xy）/(-5xy)

2. If C holds (2a + 1) shares, then A holds (2a + 1) - (a-1) = 2a -a+2

Family B holds (5a -3a-2) - (2a -a + 2) - (2a +1) = a -2a - 5

B can earn: (a -2a-5) m 18% (1-20%) = yuan.

2x-14xy-2y) (x-2xy-y) (numerator denominator colleague divided by xy) = (2 y-14-2 x) (1 y-2- x) = (-6-14) (-2-3) = 4

2: B shares: (5a -3a-2) - (2a +1) - [2a + 1) + (a - 1)] = a - 4a-3

So the amount of money B can earn is: (a -4a-3) * m * yuan.

1. Subtract 1/y=3 from 1/x: xy=(y-x) 3. Replace it with the following formula and replace xy.

2x-14(y-x) 3-2y divided by x-2(y-x) 3-y and then subtracted (x-y) to get 4

2. The number of shares held by B is (5a -3a-2) - (2a +1) - [2a + 1) - (a-1)] = a -2a-5

The money earned is (a -2a-5) * m * 18% * (1-20%)=

1.Divide by xy, respectively, then.

2x-14xy-2y 2/y-14-2/x -2*3 - 14x- 2xy- y 1/y- 2-1/x -3 -22.B's shares are:

5a -3a-2)- 2a +1)- 2a +1)-(a-1)) = a -2a - 5 shares.

Then make money.

a -2a-5) *m * 18% * 80% yuan.

12.13.Suppose last year, A sold x pairs, and B sold 12200-x x doubles x (1+6%) + 12200-x) (1-5%) = 12200 + 50x = 6000

14.Set the length of the rope x and the length of the bamboo pole.

x÷2+x=215.Set x

1 + x - 1) ×1/7 = 2 + 1/7）x= 36

16.Let the length be x and the velocity a

26x=256+a

16x=96+a

10x=160

x=16 I hope lz can understand how it came out.

12 cubes divided by it.

13 Let A be x, then B is 12200--x 106%x+95%(12200--x)—12200=50

x=6000

14 Set the bamboo pole x meters, then the rope x + meters. (x+ x=m15 with x block of sugar, then Xiao Ming's sugar is y=1 7(x-1)+1 Xiao Ying's sugar is 1 7(y-2)+2 Both are equal. The answer is your own.

16 Let the length of the car x, because the speed is equal, then (256+x) 26=(96+x) 16

1213 A is x, B is y x+y=12200 x=6000 y=6200

14 The length of the bamboo pole is x, and the length of the rope is y y-x= x-y 2= x= x= y=2

15 The original x (x-1-(x-1) 7-2) 7+2=(x-1) 7+1 solves x=36

16 Let the length of the train be x (256+x) 26=(96+x) 16 and solve x=160

A certain Lala went out to buy a certain drink, and his character exploded and won a prize. Winners of this prize can continue to redeem a bottle of the same drink. Set the probability of winning the lottery to 30%, the question is: after taking this **** activity, it is equivalent to how much discount the drink?

If you want to restore the original price, you should discount the price of the goods twice in a row by 10%, and reduce the price by 5, the current price is a few percent of the original price of a commodity is a yuan, and the price is reduced by 10%, if the original price is to be restored in the future, then the price should be raised.

Solution: Let the length be x

x/(11-7)+x/(7+11)=

x/4+x/18=

9x+2x=

x = The length of the answer is kilometers.

Take the time to find the problem.

1. Nafiber defines a new operation for rational numbers x and y: x@y=ax+by+1, where a, Zheng hall b are constants, and the right side of the equation is the usual addition and multiplication operation, knowing that 3@5=15, 4@7=28, find the values of a, b and 2@2.

2. If the solution set of inequality (a+b)x+(2a-3b)<0 is x<-1 3, find the solution set of inequality about x (a-3b) x>2a-b.

x+y=a3, when a is an integer, the solution of the system of equations { is an integer hole plexus.

5x+3y=31

Mr. Huang, Mr. Lan and Mr. Bai had lunch together. One has a yellow tie, one has a blue tie, and one has a white tie. "Have you noticed," said the gentleman with the blue-collar belt, "that though the color of our tie happens to be the last name of all three of us, there is not one of us who has the same color of tie as his own?"

Yes! You're absolutely right! Mr. Huang exclaimed, what color are the ties of these three gentlemen?

In order to improve people's living environment, in recent years, Gongshu District has taken measures such as demolishing old houses, planting grass and trees, building parks, and comprehensively managing both sides of the canal, so that the green area of the urban area has been increasing. As shown in the figure, it is a statistical map of the green area at the end of each year on both sides of the canal, according to the information provided in the figure, the following questions:

1) How many hectares at the end of 2009? How many hectares have been increased from the end of 2008?

2) In 2007, 2008 and 2009, when did you increase the most green space? (3) In order to meet the needs of urban development, it is planned to increase the positive area of green space on both sides of the canal to hectares by the end of 2010, and try to find the growth rate of green space area by the end of 2010.

Year Green area (hectares).

60 hectares at the end of the year, an increase of 4 hectares from the end of 2008;

2. The largest increase in green space was in 2008.

3. (Deficit sensitive.)

Newcomer Education Edition 6th Grade Mathematics Unit 6 Test Paper.

First, write the number directly.

2. Think about it and fill it in.

1. Commonly used statistical charts are ( ) statistical charts, ( statistical charts, ( statistical charts.

2. If you only represent the number of various quantities, you can choose ( ) statistical chart representation; If you want to represent the increase or decrease of quantity, you can choose ( ) statistical chart to represent it; If you want to have a clear understanding of the relationship between the number of parts and the total number, you can use ( ) chart to represent it.

3. The following is a statistical chart of the quality of each part of the egg. From the diagram we can see that the mass of the shell in an egg is about ( ) and the mass of the yolk is about ( ).

If an egg weighs 80 grams, then the egg white in this egg weighs ( ) grams.

4. Which statistical chart is appropriate to represent the following data?

a.Adults can't do without water, and 47% of the water in the body of adults is obtained by drinking water every day, 39% from the water contained in food, and 14% from the water released by oxidation in the body.

b.The statistics table of the favorite extracurricular activities of fifth-grade students in a certain school is as follows.

Watch TV, Play Ball, Listen** Watch**, Other.

Number of people 80 68 74 56 23

c.Xiaoqiang's height record for each physical examination from the first grade to the fifth grade is as follows.

Grades: 1st Grade, 2nd Grade, 3rd Grade, 4th Grade, 5th Grade, 6th Grade.

Height cm 125 129 135 140 150 153

A uses ( ) charts b uses ( ) charts c uses ( ) charts.

5. Look at the picture: The Chinese population accounts for about 6 billion people in the world, and China has about 100 million people.

3. Complete the following questions as required.

1. The following table is the daily intake of various foods for Xiaoli's family of three.

Kind of intake grams as a percentage of total intake.

Fats and fats 50

Milk and legumes 450

Fish, poultry, meat, eggs, etc. 600

Vegetables and fruits 900

Cereals 1800

Complete from the chart**.

2. The following figure is a statistical chart of TV programs that teachers in a school like to watch.

Teachers who like "Into Science" account for ( ) of the total number of teachers

The number of people who like ( ) shows and ( ) shows is about the same.

The number of people who like ( ) shows is the least.

If the school has 150 teachers, then the teachers who like news broadcasts are ( ).

2 Question Diagram 3 Question Diagram.

3. The above figure is a statistical chart of Congcong's living expenses in October.

This is the ( ) chart, what do you know from the chart?

If the expenditure of the Cong Cong family this month is 1,600 yuan, please calculate the amount of money for each expenditure separately.

What other questions can you ask?

4. The following is a statistical chart of the seedlings in the seedling base of the forest farm.

There are 3500 willow trees, what is the total number of these saplings?

How many pines and cypresses are there?

What percentage more poplar than locust tree?

Fourth, the wisdom of the house.

Self-evaluation*

Satisfied, relatively satisfied, still needs to work hard

I really can't find this, I'll give you a hint, check it on the Internet.