How to write question 6 on page 80 of the homework at the end of elementary school mathematics

It is the area of the large table and the area of the nine benches.

Let the side length of the square be 3, then the radius of the large circle table is , and the radius of each small circle is calculated as the area of the great circle is (=, and the area of each small circle is, because there are nine small circles, so the sum of the areas of the nine small circles is ,。.Calculate the sum and which is bigger. Which is bigger, which one has a higher utilization rate.

In the end, they are just as well utilized.

Same, large circle area: rr= 3r 3r=9 rr

Small circle area: 9 rr

Both have the same high utilization. According to the formula of circle area: area = square of x radius, let the side length of the square be x, then Master Wang's circle area is, and Master Li's circle area is ,

Because Master Wang's circle radius is equal to the length of the square side, each circle of Master Li is one-third of the radius of Master Wang's circle, and the area is one-ninth of Master Wang's, and there are nine small circles, so the total area is the same as Master Wang's, so it is the same as the same height.

Or suppose that the radius of Master Li's small circle is r, the area of a small circle is r r, and the area of 9 small circles is 9 r r;

As can be seen from the figure, Master Wang's 1 major circle radius is equal to Master Li's 3 minor circle radii (3r), and the area of 1 large circle is 3r 3r 9 r r, which is the same as the area of 9 small circles.

So both of them have the same high utilization rate of planks.

Hope it helps, I hope it be, thank you.

You didn't say any version, it's all different.

Farmers give 225 kg of fertilizer per hectare to rice. In a rectangular rice field 200 meters long and 150 meters wide, how many kilograms of fertilizer should be applied?

Specific topics.

Send it, thank you.

Question 6: (1) If the diameter of the log is 40cm, then the truncated should be a square, and the diagonal line of the square should be 40cm in diameter. According to the triangle formula, we find that the side length of the largest square in the log is 20 cm.

The length of the log is 2m = 200cm, and the area of this rectangle is 20 x20x 2 + 20 x200x4 = 16800 square centimeters = square meters, and the painted area is square meters.

2) Find the volume, the side length of the cross-section square is 20cm, the height is 200cm, 20x20x200=80,000 cubic centimeters=cubic meters.

cubic meters of timber weight.

10 to the power of -2-n.

-2m of 10 divided by 10 to the nth power.

-2 of the m-square bracket of 10 divided by the n-power of 10.

Because 10 to the power of m = 3, 10den to the power = 2

So =3 to the power of -2 divided by 2

One in 18.

My God, there is no question to do it, I didn't buy it, and it's useless to buy it.

Besides, the first-grade questions still need to be asked?

Make no mistake. Grade 1 Questions.