Grade 6 Mathematics with a bounty. An additional 10 points will be added 30

2. If China Mobile's revenue is x, then China Netcom is (X-150) 3 and China Telecom is 2 (X-150) 3

x+(x-150) 3+2(x-150) 3=4050x=210 billion yuan.

The following quantitative relationship is represented by a formula containing letters.

1、nx2、x²-3

3、b/100

4. Answer the following questions for the B-A equations.

1. Let this number be x |x/2-1|=4 7 x=22 7 or x=6 72, let this number be x x 6+2=x 5 x=603, you want to ask how many sets of cable TV can be watched without turning on, right?

Before it is opened, you can watch x sets.

5x-4=56 x=12

4. Set up another car to travel an average of x kilometers per hour.

x+45)*3=300

x=555, the average weight of the pear basket is x kg.

25*40+10*x=1420

x=426, the original price is x

x = 1207, let the first barrel of oil be x kg, then the second barrel of oil is 132-x4 5x=132-x+

x = 78 The two barrels of oil were originally 78 kg and 54 kg respectively.

Solve equations. x=-48

The first article sets the original price as x x = 150 and the second set up Netcom's income is x billion yuan.

Telecom is 2x billion, mobile is (3x+150) billion, x+2x+(3x150)=4050 x=650

1,150 yuan.

2,210 billion yuan.

The following quantitative relationship is represented by a formula containing letters.

1，n*x2，x*x-3

4,b/100

5. Solve the next question in the B-A equation.

1,x/2-1=4/7

x=22/7

2,x/5-x/6=2

x=603,5x-4=56

x=124,3*x+45*3=300

x=555,25*40+10*x=1420x=426,x=1207, let A x kg, B is 132-x1-1 5)*x=132-x+

x=78 to solve the equation.

x+18=5/8x

x=-48

Solution: Suppose he answered question x correctly.

10x-5（10-x）=70

10x-50+5x=70

15x-50+50=70+50

15x=120

x=8Answer: He answered 8 questions correctly.

Solution: If he answers x questions correctly, then he answers 10-x questions incorrectly.

10x-5（10-x）=70

10x-50+5x=70

15x=120

x=8Answer: He answered 8 questions correctly.

Number of correct answers Number of incorrect answers Score.

10 0 1009 1 858 2 70 7 3 556 4 405 5 254 6 10 Answer: He was right on 8 questions.

For 10 questions, 10 10 = 100 points, for 9 questions, 10 9-5 1 = 85 points, and for 8 questions, 10 8-5 2 = 70 points (so Xiao Li Li is right for 8 questions).

Solution: Let Li Li answer X questions correctly.

10x-5(10-x)=70

x=8 Li Li answered 8 questions correctly.

1. The circumference of the bottom surface of the storage bucket can only be (or (. Due to the limited open space in the office, the bottom radius of the storage bucket is up to 60 2cm.

1) When the circumference of the bottom surface of the storage bucket is (, the radius of the bottom surface is 40cm, and it cannot be placed on the open space, so the bottom radius can be 30cm at this time (the excess part is rolled into the interface). At this time, the volume of the storage bucket is cubic decimeters.

2) When the circumference of the bottom surface of the storage bucket is (, the radius of the bottom surface is 20cm, the open space can be put down, and the volume of the storage bucket is cubic decimeters.

To sum up, the maximum volume of the storage bucket is cubic decimeters.

2.(10 2) * cubic centimeters.

20 2) * cubic centimeters.

157 314 = Centimeters.

3. Because: "A and B two cylindrical containers, the bottom area ratio is 4:3, the water depth of A is 7 cm, and B is 3 cm," it can be assumed that the bottom area of A is 4 square centimeters, and the bottom area of B is 3 square centimeters.

Therefore: the volume of water in A is: 4x7=28 cubic centimeters, and the volume of water in B is:

3x3 = 9 cubic centimeters,"Fill both containers with the same amount of water until equal"Their volume difference is 28-9 = 19 cubic centimeters, and the difference in bottom area is 4-3 = 1 square centimeter, so now the water surface height is 19 1 = 19 centimeters, and the water surface has risen: 19-7 = 12 centimeters.

5. Let the base area of the cuboid be S1 and the bottom area of the cylinder be S2. The volume of water injected into the container per minute is v.

Then according to the two conditions of "open a faucet and fill the container with water, and at 3 minutes, the water is exactly below the top surface of the cuboid" and "the height of the cuboid is 20 cm", the equation can be obtained: 20 s1 + 3 v = 20 s2

According to the two conditions of "after another 18 minutes, the water fills the container" and "the height of the container is 50 cm, and the height of the cuboid is 20 cm", the equation can be obtained: 18 v = (50 20) s2 (simplified to 3 v 5 s2, brought into the first equation, 20 s1 + 5 s2 = 20 s2, i.e. 20 s1 15 s2).

The ratio of the bottom area of the cuboid and the cylindrical container can be obtained according to the joint solution of the above two equations: s1 s2=3 4

6. Let the radius of the bottom surface of container A be x cm.

2 + solution gives x=

If the radius is centimeters, the diameter is 15 centimeters.

9*2=252 cubic centimeters, and the cylinder accounts for 1-1 6=5 6

The round body accounts for 1 3 = 2 6

The volume of a cylinder is 36*6=216 cubic centimeters.

The volume of the cone is 36*2=72 cubic centimeters.

（25-18）/14=200g

400+200=600g

10. Let the bottom area of the bottle be x, then multiply 15=6 times x to get x= y=multiply 15=

There are too many questions, can you reduce some of them and remove the ones you will do.

Can the following number make up a proportion, if not. Why?

2 and 56 sub-hall 13

Answer] can be proportional, as follows:

Rev. 13 56):

List the proportional formulas according to the following conditions, and solve the proportions.

The ratio to x-2 is equal to 3 to 2

Answer] 2x+3):(x-2)=3:2

2（2x+3）=3（x-2）

4x+6=3x-6

4x-3x=-6-6

x=-12 vocabulary questions.

1.A and B two cars by AB two places at the same time division in the opposite direction, A and B two cars speed ratio is 2 to 3, it is known that A takes 5 and 2 times 1 hour to complete the journey, find how many hours after the two cars meet in the middle of the way?

Answer] Let the time for the completion of line B be x

According to the "velocity ratio is equal to the reciprocal of the time ratio", it is obtained:

3x=2*x=11/3.

So, the time of encounter is 1 (1

A: The time for the two cars to meet is hours.

Write the proportions of the following questions and solve the proportions.

The quotient divided by is equal to the quotient divided by the difference between x and .

Burn the evil. 8）：

The ratio of x=to 3x+y is equal to 3 to Pi 4, then what is x to y?

2x+y）：（3x+y）=3：4

3（2x+y）=4（3x+y）

6x+3y=12x+4y

6x-12x=4y-3y

6x=ySo, x:y=1:(-6).

==(= Stand in a hexagon.

Light two sticks of incense at the same time, but one of them has to be lit at the same end, and when the incense burned out at both ends, exactly half an hour has passed. Then, if only one end of the incense burns for exactly half an hour, that is to say, it will take half an hour to burn the remaining half of the incense, so then light it at two more ends, and the time taken to burn the remaining incense is 15 minutes. It takes 45 minutes for both sticks of incense to burn.

One, 8 25 =, so.

Original = x 10=

1.Stand in a regular hexagon.

2.The first one is lit at both ends, and the second one is lit at the same end. When the first one is burned (it should be 30 minutes at this time), the second one is exactly half less, and there are 30 minutes left, which is to ignite the other end of the second root, that is to say, the second root is burned at both ends together, and it can be burned for another 15 minutes, plus the first 30 minutes, exactly 45 minutes.

25==

1. Stand in an equilateral hexagon.

2. Take the watch and burn it for 15 minutes, and the rest is 45 minutes of incense.

If the input price of 50 soccer balls is $x, then the purchase price of 40 basketballs is (3000-x) yuan.

9%x+11%（3000-x）=298

x=1600

1600 50 = 32 yuan (3000-1600) 40 = 35 yuan.

A: The input price of each football is 32 yuan, and the purchase price of each basketball is 35 yuan.

Solution: Set the football purchase price x yuan.

50x*9%+(3000-50x)*11%=298x=32

3000-50 32) 40 = 35 yuan.

A: The price of football is 32 yuan, and the price of basketball is 35 yuan.

For each x yuan of football, volleyball is (3000-50x) 409% x 50+(3000-50x) 40 11% 40=2981x=32

x=323000-50x）/40=35

A: 40 yuan for football and 35 yuan for basketball.

Solution: Set the football purchase price x yuan.

50x9%+(3000-50x) 11%=298 by the meaning of the title:

The solution is x=32 (3000-50 32) 40=35 yuan.

A: The price of football is 32 yuan, and the price of basketball is 35 yuan.

Set the unit price of football to be $ x and the unit price of basketball to be $ y.

then 50x+40y=3000

50x*9%+40y*11%=298

Solving the system of equations yields: x=32 yuan, y=35 yuan.

Have fun!

Solution: If the purchase price of football is X yuan, it costs 50x yuan to buy football, and the rest (3000-50x) is the money spent to buy basketball.

50x*9%+(3000-50x)*11%=298 (based on a profit of 298 yuan).

x=323000-50 32) 40=35 yuan.

A: The price of football is 32 yuan, and the price of basketball is 35 yuan.

Its practical binary system of equations is also fine, but considering that the sixth grade may not have been taught here, if you can accept the binary system of equations, take a look at the following.

Set the unit price of football to be $ x and the unit price of basketball to be $ y.

Get: 50x+40y=3000

50x*9%+40y*11%=298 Simplification;

Combine x100 to get 450x+440y=29800 and x9 to get 450x+360y=27000 - get 80y=2800, y=35

So x=32

The second method is for your reference, for the sake of me typing so many words and typing the draft by myself, give it the best.

I'll be the first to answer, give me satisfaction.

Here we go!Suppose all 10 questions are correct.

10*10=100 points.

100-70 = 30 points.

Because every answer to a question, there is a possibility of being right or wrong, and if each question is correct, it will be 10 points more, and if it is wrong, it will be 5 points less, and it is impossible for each question not to add or subtract points, so each question is 10 + 5 = 15 points, and finally 30 15 = 2 questions, there are two wrong questions, and there are 8 correct questions.

Good luck to the questioner.

The hypothesis method is the enumeration method, and the assumption is correct.

10 questions, 100 points.

9 90-5 = 85 points.

8 80-10 = 70 points.

Li Li got 8 questions right.

Suppose Li Liquan answers correctly:

10*10=100 points.

100-70 = 30 points.

10 + 5 = 15 (points).

30 15 = 2 (Dao).

10-2=8 (channel).

Answer: He got 8 things right.

If x is correct, 10-x are incorrect.

10x+(-5(10-x))=70

The solution is x=8, so answer 8 questions correctly.

If the correct answer is x to 10x-5(10-x)=70, then x=8

Answer: Li Li answered 8 questions correctly.

Solve the system of equations for the correct x lane and the wrong y lane x+y=10 10x+5y=70 Then do the math yourself.