How to use the knowledge of primary school mathematics to answer the following questions?

1) If the water in the tank is 6 cm, it is obvious that all the iron will be submerged in the water.

The volume of the iron block is 64 cubic centimeters.

And the bottom area of the cylinder is 64 square centimeters.

Volume = Base Area High.

Therefore, the height of the water surface rise can be found to be 1 cm.

2) When the water depth is two centimeters, the iron will not be completely submerged in the water.

The volume of water can be calculated as the base area of height = 64 2 = 128 cubic centimeters.

When the iron block is inserted, the volume of water does not change.

The area is reduced to the bottom area of the cylinder - the bottom area of the iron block.

The base area of the iron block is 4 4 = 16 square centimeters.

Therefore, after putting in the iron block, the bottom area of the water is 64-16 = 48 square centimeters.

Height is the volume divided by the area.

128 48 = centimeters).

Note: The mistake is that when the iron is placed in the water, the height of the water will rise, so the iron is not half submerged in the water, but more than half.

Difficult questions, to have a clear understanding of space.

1. The edge is 4 cm long and put it in 6 cm of water, this question is relatively simple:

First, find the volume of iron sheets: 4 4 4=64

Then find the height of the water rise: 64 (8 8) = 1

2. The water depth is 2 cm, at this time you can only consider the water, first find the water volume: 8 * 8 * 2 = 128 and then find the bottom area: 8 * 8 - 4 * 4 = 48

Then find the height of the water: 128 48 = 8 3

Water surface rise: 8 3-2 = 2 3

4 4 4 (8 8) = 1 cm If the depth of water in the tank is 6 cm, the water will rise by 1 cm.

If the depth of water in the tank is 2 cm, it can only be submerged half: 1 2 = cm.

First, determine whether the cube iron piece can sink into the water. 1) No, the conditions are insufficient, and it can't be calculated. 2) It can be based on the principle of the same volume.

If the depth of water in the tank is 2 cm, it will only sink halfway.

A: The water will rise1.

A: The water will rise.

This can be solved by using the drainage method.

Elementary school math formulas about proportionality:

Distance: Time = speed (certain), distance and time are proportional.

Workload: Working time = work efficiency (certain), workload and working time base type are proportional.

Total price: quantity = unit price (certain), the total price is proportional to the quantity.

The distance on the diagram is disproportionate: the actual distance = scale bar (certain), and the distance on the diagram and the actual distance are proportional to the bucket pin.

Characteristics of proportionality:

1. When the value of x in the inverse proportion, the value of the independent variable is also converted into its reciprocal, and the inverse proportion is transformed into positive proportionality. When the value of x in a positive proportion (the value of the independent variable) is converted to its reciprocal, the positive proportion is converted to an inverse proportion.

2. The proportional image is on a ray that passes through the origin. It is from the intersection of the abscissa and ordinate of the statistical table along the diagonal line from the lower left corner to the upper right corner, extending to the outside of **, where it can extend downward in the sense of proportionality, so it is considered a straight line.

For every 10 liters of oil, the weight of a large truck is 5 tons, and the load capacity of a small truck is 4 tons, so 1,570 tons of goods are used in large trucks.

The remaining 6 tons are 15 liters of oil in both cases

Big truck x1, small truck x1

Small truck x3 so send big truck 315, small truck 1 or large truck 314, small truck 3 at this time need gasoline 3140 + 15 = 3155 liters.

From the title of the title: 10 5 = 2 (liters) per ton of fuel transported by large trucks, and 5 2 = liters per ton transported by small trucks).

Therefore, the first 1575 tons are transported by large trucks, and the fuel consumption is (1575 5) * 10 = 3150 (liters).

The remaining one ton is transported in a pick-up truck, which consumes 5 liters of fuel.

So the total fuel consumption is 3155 liters.

A square consists of two triangles that are equal in area. The base edge of the triangle is the diameter of the circle, and the height of the triangle is equal to the radius of the circle. Forget it.

Didn't you memorize the square rate......

Is there a shadow missing? Bottom left?

s abc=48 high side argument.

s shadow = 24 - (silver lack high box) - (high).

8 * yuan, so the first-class pricing yuan.

[=[==Yuan.]

The ** of first-class apples is yuan kilograms.

If there is a total of a kilogram, then the total cost = yuan.

Total income = yuan.

Income B = RMB.

Income A = 3a-27a 16 = 21a 16 yuan, then ** = 21a 16 3a 8 = yuan.

A wants to sell for dollars.

The ** of first-class apples is yuan.

Apple's ** is a yuan kilogram.