Help me solve the following problems, add if you are good

1. A cuboid-shaped wooden block, its length, width, and height are 3m, 2m, and 1m respectively, divide the length into 5 parts, the width into 4 parts, and the height into 3 parts, and then cut it. What is the sum of the surface areas of these 60 cuboids in square meters?

The cuboid length is.

3 5 meters.

Wide is. 2 4 meters.

High is. 1 3 1/3 meters.

The surface area of each cuboid is.

1/1 1) 2 4/3 square meters.

The sum of the surface areas of these 60 cuboids is.

4/3 60 80 square meters.

2. In a cylindrical container, put a spherical iron block, turn on the faucet for 3 minutes, the water is just over the top surface of the spherical iron block, and after another 18 minutes, the cylinder is filled with water. Now it is known that the height of the container is 50 cm, and the radius of the ball is 10 cm, so the volume of the iron block is the volume of the cylinder

The height of the ball is.

10 2 20 cm.

Top 50 20 30 cm to 18 minutes per minute of watering.

30 18 5/3 cm.

Do not put the ball filled with water as needed.

50 5/3 30 points.

The space occupied by the ball is filled with water needs.

30 18 3 9 min.

The volume of an iron block is cylindrical volume.

9 30 3 out of 10

3. Among the natural numbers of 1---2008, there are numbers that are divisible by 2 but not divisible by 3 or 7

1 - 2008 divisible by 2 has.

2008 2 1004 pcs.

There are ones that are divisible by 2 and 3.

2008 (2 3) 334.

There are those that are divisible by 2 and 7.

2008 (2, 7): 143.

There are divisible ones that are divisible by 2, 3 and 7.

2008 (2 3 7) 47 pcs.

Among the natural numbers from 1 to 2008, there are numbers that are divisible by 2 but not divisible by 3 or 7.

1004 334 143 47 574.

1.The length is divided into 5 parts, and the width is divided into 4 parts, which is increased by 3*1*6=18 square meters.

The high division is divided into 3 parts, and the increase is 3*2*4=24 square meters.

2.The volume of the iron block is 3 10 of the volume of the cylinder

3.Of the natural numbers of 1---2008, there are 547 numbers that are divisible by 2 but not divisible by 3 or 7.

Haha, 1 yes yes 1 yes 574. Wrong to find me, writing more does not mean computing power.

2.If the volume of the cylinder and the sphere are v1 v2 respectively, then if a total of v1-v2 water is filled in 3+18 minutes, then (v1-v2)*(3 21) of water is filled in the first three minutes.

From the height of the water in the first three minutes is 10cm, and the height of the container is 50cm (the water filled in the first three minutes + v2) v1 = 10 50.

substitution solution, v2 v1 = 1 15

3 This is based on the principle of repulsion. [2008/2]-[2008/(2*3)]-2008/(2*7)]+2008/(2*3*7)]=574

The answer to the first question is 80 square meters'''The answer to the second question is 1 in 50'''

What grade is it?

Ahh I'll help you sprinkle.

1.The density is calculated as: p=m v

2.Nature is the most dense. It seems that the class thinks that it should be diamond, because it is the hardest material in nature, so it is also very dense.

3.This is because, when you are shaking the water bottle quickly, the atmospheric pressure inside the bottle is less than the atmospheric pressure outside the bottle because of the fast flow rate, so it is not easy to leak out.

It's a principle in junior high school physics, and you can try it, Hehe.

4.Math, I'm probably not very good at it.

5.(1) You should be stationary with the bench, and 2) you should know how to maintain a balanced distribution of the gravity you are subjected to.

Children are not allowed to go to school, Hehe).

6.This uses the principle of leverage, and we first need to know that l1f1=l2f2

Then, find out where the power arm is most effortless, the outward-facing the better, but don't overdo it (hey, not too detailed).

7.For example, lubricating oil will be added to our self-envy hole driving, which is to reduce friction, so it is also labor-saving.

8.Because of the new money, the hardness is OK, and the front edge is very thin, because the hardness is OK. According to the physical principle that the smaller the force area, the greater the pressure.

So he can cut through the paper, but fast.

9.The balance should tilt to the right. Because the quality of water in the beaker is the same, put it on the right side like a weight.

Although the weight will exclude drinking water of the same mass as him, which is part of the chapter of the law of buoyancy, but. The discharged water will be caught by the tray, so the right side is heavy and the balance is tilted to the right.

My Li is gone, you can use it if you want it. Hee-hee. m

p=m divided by the mass of the object with v density divided by the volume. Nucleus...

There are too many questions, and I have to write it myself, Wang Renqiao, and find some answers on the Internet.

..2. Metal, ice, there are too many problems

Because: a processing per hour: 13 5 pcs).

b processing per hour: 10 4pcs).

So: a faster.

aHourly: 13 5=pcs.

b per hour: 10 4 = a fast.

The area of the so-called tile is mainly to find the radius of a bottom surface is 3 meters, and the side area of a cylinder with a height of meters plus a base area.