Ladies and gentlemen, who will do this??? Urgent!!!!

Have ulterior motives and peace of mind.

Teeth are less sharp, and sincerity is sincere.

Bing Xin is bold and careful.

Frightened and compassionate.

The heart corresponds to the courage and loyalty.

Wishful thinking, don't have a heart.

Teeth are less sharp, careless and buoyancy.

Talk about your heart and your heart.

Is this it?

Female teachers are male teachers.

2 7, then male teachers are 7 2 of female teachers, female teachers are 2 3 of male teachers, then male teachers are 3 2 of female teachers, 3 2<7 2, the proportion of male teachers decreases, and the question is wrong.

The original number of male teachers x and female teachers was 2x 7, and after the transfer of 2 male teachers, there were 2 female teachers (x+2) 3 people, and the number of female teachers did not change

2x/7=2（x+2）/3

x/7=（x+2）/3

3x=7x+14

4x=-14, x=-7 2<0, false.

n n can find the rule, 1 + 3 = 4 = 2 * 2, then 3 = 2n - 1, then n = 2, its result is n n

Similarly, 1+3+5=9=3*3, then 5=2n-1, then n=3, and its result is n n

Just push it down.

And so on, each formula has a few terms that are squared.

Then 1+3+5+7+9....2n-1) has n terms, which is n 2

1 (1) flowers, language, long, month, people, names, mountains, shows, 2) the stars move, the flowers are transferred, the wood has become a boat, including the slow boat and car fatigue, pause and beat the chest.

2. Colorful clouds chase the moon. Heavy responsibilities. A drop in the ocean, showing off the wisdom. Still waters run deep.

3.Dive into the night with the wind, moisturizing things silently.

4. Enumerate the omission of similar things.

5. Leave no stone unturned to talk about the power of the eggplant mold, and the emerald color is cross-current.

The outer diameter is 71 cm, that is, the diameter of meters, one rotation is the circumference, and the circumference is the diameter multiplied, that is: the circumference is equal to about the meter, 100 revolutions per minute, that is, the speed is in meters, and the bridge length is 2400 meters divided by 223 = minutes.

Solution: (71 2) cm (wheel length per week) unit conversion).

2400 (100 minutes.)

A: It takes about 5 minutes.

I wish you progress in your studies o( o

Sorry, some of the elementary school forgot, the outer diameter is the diameter of Ha.

71× cm

2400 (100 minutes.)

Circumference = cm = m.

Meters per minute.

Time required=2400 minutes.

2400 (Approximately 11 minutes.)

First find the circumference of the wheel, convert it to meters, then find the length of 100 laps, and finally find the approximate number of minutes, which is estimated to be 11 minutes.

First find the circumference: cm; Find another 1 minute (length of 100 circles): cm = m; Finally, divide the bridge length plus the sum of 1 circumference by the length per minute: (2400+ equals about 11 minutes.)

The outer diameter is 71 centimeters, and the circumference is multiplied by the diameter, i.e., centimeters.

There are also 100 revolutions per minute, that is, 100 * centimeters = meters per minute.

The bridge is 2,400 meters long and takes 2,400 minutes to pass.

Calculate the circumference (71+86) 10=1570 meters.

Diameter: 1570 meters.

Radius 500 2 = 250 meters.

The area is 250 250 square meters.