Math problems will be scored with an additional 50

The high af on the edge of the bc is obtained from the inscription ab=2 af=root2 area, which is also root2

504 km.

The distance between the two places is x kilometers.

Then: x (26+2)+3=x (26-2) solves the equation to obtain:

x = 504 (km).

Hello, the detailed answer is as follows:

Port A and Port B are located x kilometers apart. Since the journey from A to B is downstream, the actual velocity is the velocity of the boat in still water 26 plus the velocity of the water 2 = 28, so that the time used is x 28;The actual velocity = 26 - 2 = 24, so the time taken is x 24.

From this we can list the equations:

x 24 - x 28 = 3, and the solution x is 504

Let the distance be x, and get x (26+2)-x (26-2)=3 and solve x=504 Remember to add points.

(1) When starting from point A to the BC side, point P is 6 cm away from point B, point C is 8-6 = 2 cm, ** to the CD edge, 2 cm away from point C, 6-2 = 4 cm from point D, and then ** to the AD side, 4 cm away from point D, 8-4 = 4 cm from point A, ** to edge AB, 4 cm away from point A, 6-4 = 2 cm from point B, ** to edge BC, 2 cm away from point B, 8-2 = 6 cm from point C, and then ** to point D. A total of 5 times, according to the Pythagorean theorem, the total length is calculated as: 24* (2 under the root number).

2) When the ratio of ab:ad is 5:4, the collision 7 times coincides with point b.

Remember to add points)

One. Find the surface area of the cylinder.

1.The radius of the base surface is 5 dm, and the height is 4 dm.

Dm. Two. 1.The height of a beverage can is 10, the bottom diameter is 6, what is the square centimeter footprint of this beverage can?

square = 2What is the minimum area of wrapper needed to cover the side of a beverage can with a circle of wrapper?

3.How many square centimeters of iron sheet are needed to make such a beverage can?

Cm. Three. 1.A cylindrical bucket without a lid, 60 cm high and 20 cm radius on the bottom, paint the outer surface of the bucket, how many square centimeters is the painted area?

Cm. 2.The bottom surface of a circular ventilation pipe is 20 cm in diameter and 40 cm in length. How many square centimeters of iron sheet do you need to use to make 20 such ventilation pipes?

Cm.

Solution: The manuscript has a total of 30 points * 80 words = 40 * 60 = 80 * 30 = 60 * 40 = 2400 words.

Then Xiaojun typed 2400 50 = 48 in 1 minute.

Li Qiong takes 2400 32 = 75 minutes.

1. From the question, it can be seen that the part has a total of 30 * 80 = 2400 words, and the number of words that Xiaojun types in one minute is 2400 50 = 48;

32 = 75 (minutes).

Let x first, and the final unity is the answer.

1.(224-84)÷x=84÷3=

Freshly made, well done!

340 (68 15 17) = 5 and 2 3 hours = 5 hours and 40 minutes.

5 days, hours, 7 hours, 24 meters, 18 days. The third question is obviously 7 hours, upstairs and downstairs I don't know how you calculated,