The following math problem good to get five points of wealth 5

1.A job can be completed by 10 hours of cooperation between A and B. If you do it by A, it can be completed in 30 hours, and if you do it by B, how many hours can it be done?

2.Use a sum of money to buy a homework book. If you buy 20 copies of texts alone, you can buy 30 copies of math books. Now I buy 1 copy of the text and 1 copy of mathematics as a set, how many sets can I buy with this money?

3.The warehouse has 450 tons of cargo. It can be transported in 10 hours with car A and 15 hours with car B. How many hours can two cars be transported together?

2. Only columns are not calculated.

1.There are 200 girls in the sixth grade, and the number of boys is 125% of the number of girls.

2.There are 200 girls in the sixth grade, and the number of girls is four-fifths of the number of boys.

15 hours 12 sets of hours.

250 people 250 people.

Solution: 1

Trapezoidal vegetable plot area = (60 + 100) 40 2 = 3200 (m) total fertilization = 3200 kg).

2. Because if you cut a square in the garden, the diagonal length of the square is the diameter of the garden. Square area = diagonal * diagonal 2

Diagonal length = 6 (dm).

The area of the square = 6 6 2 = 18 (dm).

3. The edge length of the cube frame = 36 12 = 3 meters.

Colored paper area = cube surface area = 3 3 6 = 54 square meters of square paper box volume = 3 3 3 = 27 cubic meters.

4. The maximum amount of gasoline that can be filled in the fuel tank = the volume of the fuel tank = 8 5 cubic decimeters) = 60 (liters) plus the amount of money for gasoline in the fuel tank = 60 yuan).

5. The bottom diameter of the biscuit box = 2 5 = 10 (cm) The height of the biscuit box = the side length of the square = the circumference of the biscuit box = 10 = cm) The volume of the biscuit box = the bottom area of the height = 5 cubic centimeters) 6. The bottom radius of the glass = 6 2 = 3 (cm).

The bottom area of the glass = 3 = square centimeters).

The volume of the glass = the bottom area of the glass The height of the glass = cubic centimeters) The volume of 4 cups = cubic centimeters) = cubic decimeters) = liters).

Because the volume of 4 cups = liters >> 1 liter.

So it can't go to 4 cups.

kilograms) square decimeters).

3.(36 12) (36 12) 6 = 54 (square meters) (36 12) (36 12) (36 12) = 27 (cubic meters) 48 5 liters).

Yuan) 5The height is 2 5 = 10 (cm); Volume = 5 5 10 = 250 (cubic centimeters).

6.The volume of the cup is 3 cubic centimeters).

1 liter = 1000 cubic centimeters.

1000, can not pour 4 cups.

1、(60+100)x40/

2. The side length of the square is 6 root number 2 = 3 times root number 2

The area of the square is 3 times the root number 2x3 times the root number 2 = 18

3. The cube has 12 sides, so the side length is 36 12=3 The surface area of the square is 6x3x3=54

The volume of the cube carton is 3x3x3=27

4. The volume of the fuel tank is cubic decimeter = 60 liters.

5. The height is the circumference of the bottom surface = 2 r = 2x x5 = 10 6, the volume of the glass = RRH = x3x3x10 = 90

to less than 4 cups.

1.(60+100)*40 2*kg).

2.6*(6 2) 2*2=18(decimeter)336 12=3 (m) 3*6=18 (m) 3*3*3=27 (m).

4.8 5 liters).

60 * yuan) 5Height: 2*cm) Volume: ml).

6.ml) = liters).

liter 1 liter. A: It cannot be up to 4 cups.

1.(60 + 100) * 40 2 = 3200 (square meters) 3200 * kilograms) square decimeters).

3.(1) 36 12 = 3 (m) 3 * 3 * 6 = 54 (sq m) (2) 3 * 3 * 3 = 27 (m3).

4.(1) 8 * 5 * cubic decimeters) = 60 liters.

2) 60 * yuan) cm).

1.(60+100)*40/2*

840 kg.

18 decimeters. Paste colored paper on the surface of this cube, at least 3 * 3 * 6 = 54 square meters of colored paper The volume of this cube carton is 3 * 3 * 3 = 9 cubic meters 4This tank can hold 8*5* liters of gasoline.

Each liter of gasoline is 60* yuan, plus a fuel tank of gasoline.

5.The height is 2 * 5 * cm, and the volume is 5 * 5 * cubic centimeter cup = liters.

4 cups = liters >> 1 liter can't.

1. (100+60)*40 2*kg.

2. The diameter is 6 decimeters, so the diagonal length of the obtained square is 6 decimeters. Its area is equal to 6 * 6 2 = 18 square decimeters.

3. The cube has a total of 12 edges, and each edge is 3 meters long. Its surface area is 3 * 3 * 9 = 54 square meters. That is, at least 54 square meters should be used.

Volume = 3 * 3 * 3 = 27 cubic meters.

4. Volume = 8 * 5 * cubic decimeter = 60 liters 60 * yuan 5, because the cylindrical shape gets a square, so the side length of the square is equal to the circumference of the bottom surface, h = 5 * 2 * cm.

Volume = 5 * 5 * cubic centimeters.

6. The volume of this glass is 3*3*cubic centimeters.

1 liter = 1 cubic decimeter = 1000 cubic centimeters.

That is, you can't pour 4 cups.

1.Find the area: (60+100)*40 2*

2.The diagonal diagonal length of the square is the diameter of the circle: area = 18s = 36

v=36 to find the volume v=60l

348 yuan. 5 The height is the circumference of the circle l=cm v=

6 Find the volume of the glass, then divide 1L by the glass to be mentioned, if the result is greater than 4!

In the first question, adjacent, 2 times 5, not adjacent, 6 minus the number of adjacent fronts, that is, 6 minus 2 multiplied by 5.

The first question, AB is adjacent, and the answer is 5!*2。Not adjacent, 4!*2+3*4!*4。

Math is too hard, and neither will I.

This platform is for everyone to ask questions to learn, not to help you pass the exam by improper means and get good results.

Take a piece of scratch paper, draw little by little, don't be lazy, get something for nothing.

(1) Let the average annual growth rate of car ownership in the city be x, list the equation according to the topic, and the solution that does not meet the topic can be rounded;

2) If the number of new cars in the city is y0,000 taels every year, then the number of cars in the city at the end of 2011 and the end of 2012 is obtained, so that the inequality can be solved Answer: Solution: (1) Let the average annual growth rate of car ownership in the city be x, according to the question, 15 (1 + x) 2 =

Solve x1=,x2=not fit the topic, discard)

A: The average annual growth rate of car ownership in the city is 20%;

2) If the number of new cars in the city is y0,000 taels every year, the city's car ownership at the end of 2011 will be 10,000 taels, and the city's car ownership at the end of 2012 will be (10,000 taels

According to the question: (, the solution is y 3, answer: the number of new cars in the city can not exceed 30,000 taels per year Comments: This question examines the application of one-dimensional quadratic equations and inequalities, judges whether the solution is in line with the topic, and discards the unsatisfactory solution Finding the key descriptor and finding the equation with an accurate equivalence relationship is the key to solving the problem.

One. 1.Solution: Let the height of the triangle be x decimeters, and get:

8*x/2=12

2.Solution: Let Mercury orbit the Sun for x days, get:

4x+13=365

3. Solution: Let car B travel x kilometers per hour, get:

5*55+5x=450

Two. 1.Solution: Let the width of this rectangle be x meters, get:

2*（36+x）=120

2.Solution: If this publishing house prints x copies of wall calendars on average every day, it gets:

4x+400=3200

3.Solution: Let the diameter of the earth be about x million kilometers, and get:

100x+4.Solution: Let's say my brother bought x books, so my brother bought 2x books, and he got to:

x+2x=33

One. 1. 12=

h = 3 dm.

2. 365-13=4x

x = 88 days.

3. 55*5+5x=450

x = 35 km.

Two. 1. 2（36+b）=120

b = 24 meters.

2. 4x+400=3200

x = 700 copies.

3.x = 10,000 kilometers.

4.If the younger brother buys x copies, the elder brother buys 2x copies.

x+2x=33

x = 11 copies.

The younger brother bought 11 books, and the older brother bought 22 books.

1: 8x 2=12 base x height 2 area.

2: 4 x + 13 = 365 The time it takes for Mercury to orbit the Sun x 4 + 13 The Earth orbits the Sun 3: 5 (x + 55) = 450 (distance - A speed x time) Time 1: 2 (36 + x) + 120

2：4x+400=3200

3：100x+

4：x+1/2x=33

—。1. Area = 1 2 x bottom x height 12 = 1 2x8xa2, the number of days around the earth = the number of days around Mercury x 4 + 13 365 = 4a + 133, the distance traveled by car A = the total distance between car A and car B - the distance traveled by car B 55x5 = 450-5a

1、（36+a)x2=120

a=3200-400

A+4, Brother She bought a book 1 2A+A=33

1. If you think that Yuan = 17 knives x Yuan.

Yuan The original price is yuan, which is not in line with the topic and is discarded.

If you think that Yuan = Yuan x 37 knives.

Yuan The original price is yuan, which is in line with the title.

Price reduction per knife.

16651665 + 1998 + 19981998 + 199819981998 166516651665

333 x 6 ) / ( 333 x 5)=6/5=

1.The smallest unit of money is cents. So find all the factors of 6290 and get 1, 2, 5, 10, 17, 34....Since it is a price reduction, it is no longer care after 34. So the possible selling price of the knife is yuan or yuan or or.

Considering the reality, I recommend the choice. So the price was reduced.

2.Original = 1998 (1 + 10001 + 100010001) [1665 (1 + 10001 + 100010001)] = 1998 1665 =

The second sub-question does this:

17 * 37 = 629 (the only decomposition) to launch the knife price reduction yuan;

A: $100 B: $5 C: $3.

List 1x+4y+4z=132 (while dividing by 10000) by the title: Equation 14x+18y+16z=538 Equation 2

5x+24y+22z=686 Equation 3

Eq. 3-(Eq. 1 + Eq. 2) gives 2y+2z=16, that is, y+z=8 is brought into the equation, and x=100, y=5, z=3

If the unit cost of A, B, and C products is X, Y, and Z respectively (10,000 yuan kg), then there are 100X+40Y+40Z=132

400x+180y+160z=538

500x+240y+220z=686

The combination of these three equations can be solved: x=1 y= z= (in 10,000 kilograms).