A more difficult math problem Rush Rush 5

The actual length of the runway is x meters.

From the title: (x-1):(x-2)=x:(

Solution: x=101

110-101 9 (m).

A: They ran 9 meters less than 110 meters.

B runs 1 meter for the time, C runs for the meter.

Therefore, at the same time, the distance of C is 99 100 of B.

C runs 1 100 less than B

So the overall length = meters.

Less than 110 meters:

110-101 9 (m).

First, find the dch congruent cge before verifying gc=hc

Want to prove this. You need to prove GCE HCB first

There is a problem with this question itself, it seems to be logical but it is actually a wrong question, 27 can not be added 2, 2 yuan is part of 27 yuan, how to add it well, 3 people spent 9 + 9 + 7 = 25, 25 is earned by the boss, and the other 5 is fast is the other 2 people take 1 yuan each, and one person divides 1 yuan to hide two yuan, 1 + 1 + 1 + 2 = 5, so 5 + 25 = 30, it is impossible to get 29.

The speed is 5 x km/h, and the distance is ykm.

then there is y 5x-y 6x=

6y-5y=45x

y=45x, the time is 9 hours.

36 minutes = hours.

200/5x+(45x-200)/

40/x+(36x-160)/5x=

200+36x-160=42x

6x=40, so 45x=45 6*40=300

Very difficult? Frightened by the title.

It's not difficult, it's troublesome.

1. The curve is a semicircle, 100 meters long, so the radius r = 100 meters 2, the runway is 7 = meters wide, so the length of the outermost ring = 100 2 + 2 = meters.

3. Plastic area = runway area = 100 2 =

Grass area = 100 2 = 6370 Since you didn't give a map, if the semicircle inside the runway bend is also grass, then the grass area should be added = , a total is.

4. Grassland** = 6370 50 = 318500 yuan plastic** = 350 = yuan.

A total of yuan, less than 2 million, can be started.

Similarly, if the semicircle inside the curve is also grass, then grass** = 50 = yuan.

**The total is 1731363 yuan, which is also less than 2 million, and can be started.

1. The circumference of the sports field = the circumference of the circle + 2 straights The circumference of the circle = 200m = 2 r r =

2. The radius of the outer circle of the outer road is r=r+ perimeter=2 r+2l=( the radius of the inner circle of the outer road is r=r+ perimeter=2 r+2l=3, turf area = 2r 100+ r = 6370 + area of the outer runway = 2r 100+ r =8290 + 5395 = 13685

Plastic area = area of the outer runway - turf area = 4130 4, the total price of turf = area unit price =

The total price of plastic = area Unit price = 4130 350 = 1445500 total price = 1923265 2 million yuan can be started.

1、r=100/π

3. Green grass (100) 200 100 plastic (100 + green grass area.

4. Just get the answer to the third question and calculate the cost.

I won't be the answer, tangled.