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(1) Cylinder, the diameter of the bottom is 10 meters, calculate the volume (2) Cone, 16 decimeters high, 15 decimeters diameter of the bottom, volume (3) A cylindrical bucket, bottom circumference is 314cm, the cylindrical bucket side area is how many square centimeters? (4) Gaojiatun needs to dig a cylindrical reservoir with a volume of 37.68 cubic meters and a depth of 3 meters. How many square meters should its bottom area be? (5) In a measuring cylinder with a bottom radius of 5cm, there is 8cm high water in it. When an iron block is put into the measuring cylinder, the water surface rises to 10cm, and the volume of the iron block is calculated (6) ABCD is a rectangle. If DC = 40 cm and BC = 25 cm are known, and then rotate 360 degrees around DC, what is the volume of the body after rotation (7) A cylindrical aluminum ingot has a circumference of 62.8 cm at the bottom and a height of 25 cm. What is the volume of this aluminum ingot? (8) There is a conical part with a diameter and height of 6cm at the bottom. What is the volume of this part in cubic centimeter? (9) There is a conical part with a bottom area of 54 square centimeters and a height of 6 centimeters. What is the volume of this part in cubic centimeters? (10) It's a rectangle, 24.84 cm long, and half of its width is the diameter of a bottom. If you cut it like this, you can make a tin oil bucket and calculate its volume (11) A cylinder with a circumference of 9.42 cm at the bottom, after obliquely cutting off a section, calculate the volume of cutting off, and the height of cutting off is 2 cm
(1) Cylinder, 15 meters high, diameter of bottom surface is 10 meters, volume (10 △ 2) & sup2; × 3.14 × 15 = 25 × 3.14 × 15 = 1177.5 (M & sup3;) answer: volume of cylinder is 1177.5m & sup3; (2) cone, 16 decimeters high, diameter of bottom surface is 15 decimeters, volume (15 △ 2) & sup2; × 3.14 × 15 × 1 /
On the 1.400-meter circular track, Xiao Jie and Xiao Hong are practicing running. Their speed ratio is 8:7. They run from the same point in the opposite direction. After 40 seconds, they are 60 meters apart for the first time to find their running speed per minute
2. Xiaoming's family wants to buy refrigerators. There are two kinds of refrigerators in the supermarket: energy-saving refrigerators and ordinary refrigerators. The ordinary refrigerators are 4000 yuan, 20% off now, and the power consumption per hour is 0.8 degrees. The energy-saving refrigerators are 4100 yuan, and the power consumption per hour is 25% of the ordinary refrigerators. When the service life of refrigerators exceeds how long, it is more cost-effective to buy energy-saving refrigerators than ordinary refrigerators?
The second question is 0.8 yuan
Let Xiaojie run at a speed of x per minute
The equation is: (7 / 8 * x + x) * 2 / 3 = 400-60
The solution is x = 272
Xiaohong speed: 272 / 8 * 7 = 238
Set the time to x hours
Equation: 4000 * 0.8 + 0.8x = 4100 + 0.25 * 0.8x
X=1500
5 / 2:1 / 5 = 1 / 4: X
5 / 2 * x = 1 / 5 * 1 / 4
1 / 5 x = 5 / 8
X = 25 / 8
1. There are the same number of red balls and white balls in the box. Six red balls and four white balls are taken out each time. After several times of taking, the red balls are just finished, and there are still 10 white balls left. How many times in total? How many red balls are there in the box
2. If the height of a cuboid is increased by 2 cm, it will become a cube. At this time, the surface area is increased by 56 square cm. What is the volume of the original cuboid?
3. A rectangular matchbox, measuring its outer box 5 cm in length, 4 cm in width and 0.8 cm in height, how much cardboard does it need to make the outer box? How much cardboard does it need to make an inner box?
A total of x times
6x-4x=10 x=5
Red ball 6 * 5 = 30
Length = width = x height = X-2
x^2*2+x(x-2)=56 x=14/3
Original volume = 14 / 3 * 14 / 3 * 8 / 3=
5*4*2+5*0.8*2+4*0.8=
5*4+0.8*4*2+0.8*5*2
I really don't want to calculate. Use a calculator
If you don't understand, you can ask me online
After the activity class, the monitor sent 15 students to clean the cleaning area, and another 2 students took the initiative to participate. At this time, the number of students who participated in the cleaning is equivalent to 13 of those who did not. How many students are there in this class?
The number of people participating in the cleaning is equivalent to 13% of the number of people who did not participate in the cleaning. Later, the number of people participating in the cleaning is 13 + 1 = 14; 2 ^ (14-15), = 2 ^ (120), = 40 (people); a: there are 40 people in this class
Yuan Longping is the father of hybrid rice. According to him, China has achieved a rice yield of 12 tons per hectare in 2010, and plans to increase the rice yield to 13.5 tons per hectare by 2012?
2. A specialized household receives a batch of Shatian pomelo, each bag is 30kg, which needs 70 bags. If there is no bag, how many bags do you need to pack 5kg more;
3. Each household uses less than 15 tons (including 15 tons) of water per month, and the charge is 1.2 yuan per ton; if the water consumption exceeds 15 tons, the charge is 5 yuan per ton. Mr. Li's family paid 33 yuan in June. Can you work out how many tons Mr. Li used in June?
QAQ will also say a question!
1、（13.5-12）÷12=12.5%
2. I need x bags
70∶x=(30+5)∶30
35x=30×70
x=60
Need 60 bags
3、15+（33-15×1.2）÷5
=15+（33-18）÷5
=15+3
=18 tons
On the application of inequality equation
A class leader in a school received a batch of saplings to plant trees. Each of them planted 4 saplings, leaving 37 saplings. Each of them planted 6 saplings, and the last one planted less than three saplings. How many saplings are there?
If there are X students in the class, then:
0＜4x+37-6（x-1）≤ 3
0 ＜ 4x+37-6x+6 ≤3
-43 ＜-2x ≤-40
21.5 ＞ x ≥ 20
20 ≤ x ＜ 21.5
The X can be 20 or 21
The number of trees calculated separately can be 107 or 111
An equation application problem of urgently seeking an inequality
Is there such an integer m that the solution of the system of equations (1): 2x + 3Y = 3m-1; 2: 4x-5y = M-9) satisfies x0? If so, find the integer M. if not, explain the reason
Solving equations
2x+3y=3m-1------①
4x-5y=m-9--------②
X = (9m-16) / 11
y=(5m+7)/11
x0
(9m-16)/11-7/5
So: - 7 / 5
It takes 10 hours for a ship to travel from a place in the upper reaches of a river to B place in the lower reaches at a constant speed, and less than 12 hours to return from B place to a place at a constant speed. The water velocity of this section of the river is 3 km / h, and the still water velocity V of the ship is constant. What conditions does V meet?
The speed from a to B is: (V + 3) km / h, the speed from B to a is: (v-3) km / h, it takes less than 12 hours to return from B to a at a constant speed, ∵ 12 (v-3) > 10 (V + 3), the solution is: V > 33. A: V satisfies the condition that it is greater than 33 km / h
Practical problems (must be solved by equations, including equations, inequalities...)
Two baskets of apples are divided into class A and class B. in class A, one person is divided into six, and the rest are divided into 13. In class B, one person is divided into five, and the rest are divided into 10. If the number of two baskets of apples is the same, and is greater than 100 but not more than 200, how many people are there in class A and class B?
Suppose that the number of class A is x and the number of class B is y, the number of apples can be obtained from Class A: 13x-7, the number of apples can be obtained from class B: 10y-5, the equation can be obtained from the equal number of apples: 13x-2 = 10Y, and the inequality can be obtained from the number of apples greater than 100 and less than 200: 100
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