The distance from the point of intersection a of the line y = KX + B and X axis to the origin is equal to 2, and the point of intersection with y is (0,1)

The distance from the point of intersection a of the line y = KX + B and X axis to the origin is equal to 2, and the point of intersection with y is (0,1)

If the distance from the intersection point a of X axis to the origin is equal to 2, then XA = + 2 or - 2
So there are:
0=2k+b
1=0k+b
The solution is: B = 1, k = - 0.5
That is: y = - 0.5x + 1
Or:
0=-2k+b
1=0k+b
The solution is: B = 1, k = 0.5
That is: y = 0.5x + 1

1. A train passes a 900 meter long railway bridge. It takes 1 minute and 25 seconds from the front of the train to the rear of the train to leave the bridge. Then it goes through a 1800 meter long tunnel. It takes 2 minutes and 40 seconds from the front of the train to the rear of the train to leave the tunnel. The speed of the train and the length of the train body are calculated
2. Distribute a batch of parts to Party A and Party B for processing at the same time. They work for 5 days and complete 2 / 3 of the batch of parts. It is known that the ratio of work efficiency of Party A and Party B is 5:3. How many days will it take for Party B to complete the task assigned to him?
3. In the forest, the hound finds a rabbit running 20 meters ahead, and immediately catches up with it. The hound has a big step. It runs 5 steps, and the rabbit runs 9 steps. But the rabbit moves fast. The hound runs 2 steps, but the rabbit can run 3 steps. How far can the hound catch up with the rabbit?

1. The speed of the train V, the length of the body L
1 minute 25 seconds = 85 seconds, 2 minutes 40 seconds = 100 seconds
85v=900+l
100v=1800+l
The solution is: v = 60, l = 4200
How fast and long this train is!
2. Do you mean that the rest will be processed by Party B?
It takes X and y days for Party A and Party B to do it alone
1/x÷1/y=5/3
（1/x+1/y）*5=2/3
The solution is: x = 12, y = 20
The number of days required by Party B is:
（1-2/3）÷1/20=20/3
3. Let the dog run an average of M steps per unit time in N steps
So the distance of dog running in unit time is Mn
In the same time, the rabbit ran 3 M / 2 steps in 5 N / 9 steps
So the distance of rabbit running is 3m / 2 × 5N / 9 = 5MN / 6
The velocity difference between them is: mn-5 / 6MN = Mn / 6
It took 20 / (Mn / 6) = 120 / Mn to catch up
The running distance of hounds is: Mn * 120 / Mn = 120 (m)

A. B is the two ends of a diameter of a circular road. At present, a and B run in the opposite direction from two points a and B at the same time (the speed of a and B may not be the same). Suppose that when B runs 100 meters, a and B meet for the first time, when a runs a circle with a distance of 60 meters, a and B meet for the second time, then when a and B meet for the twelfth time, How many laps and meters has a finished?

When they met for the first time, they finished half of a lap. At this time, B finished 100 meters,
From the first meeting to the second meeting, they finished a circle together. The distance of B is: 100 * 2 = 200 meters, more than 60 meters of a point
The first time we met, a ran: 200-60 = 140 meters. The first lap of the track is: (140 + 100) * 2 = 480 meters
The speed ratio of a and B is 140:100 = 7:5,
From the first encounter, after each encounter, the two people walked a total of 480 meters, of which a ran: 480 * 7 / (7 + 5) = 280 meters. The 12th time a ran: 140 + 280 * (12-1) = 3220 meters, that is: 3220 / 480 = 6 laps and 340 meters

(2 minus 2 / 3) multiply (3 minus 3 / 4) multiply (4 minus 4 / 5) multiply (9 minus 9 / 10)

2-2 / 3--4 / 33-3 / 4--9 / 44-4 / 5--16 / 5--9-9 / 10--81 / 10 multiply to get 2 & # 178; * 3 & # 178; * 4 & # 178; * 5 & # 178; * 6 & # 178; * 7 & # 178; * 8 & # 178; * 9 & # 178; / (3 * 4 * 5 * 6 * 7 * 8 * 9 * 10) = 4 * 3 * 4 * 5 * 6 * 7 * 8 * 9 / 10 = 72576

Xinhua bookstore has a batch of new books. It sells 1 / 4 of the total in the morning and 3 / 7 in the afternoon. There are 180 left. How many new books are there
Please list the formula!

180 divided by (1-1 / 4-3 / 7) = 472

How to write 1: 20, 30, 40, 50, 60, 70, 80, 90

1--10 one two three four five six seven eight nine ten 11--20 eleven twelve thirteen fourteen fifteen sixteen seventeen eighteen ninteen twenty30--90 thirty fourty fifty sixty seventy eighty nin...

If 1 / 5 x equals 7 / 7 y, then x is proportional to y

x／5＝y／7
x／y＝5／7
In proportion

Correct mistakes in English sentences
1.Because I am tired,so I don't want to go to work.
2.Do you want to in the school play?
3.It's raining.Don 't to go out.
4.Everyone in the group have a pen pal.

I don't want to go to work.,.because I am tired,so
.Do you want to play in the school?
3.It's raining.Don 't go out.
Everyone in the group has a pen pal.

In 1900, 1998, 2000, 2008, 2010 and 2020, () is a leap year

The whole ten years should be divisible by 400 and the rest by 4

One third = 0.33333 three cycles, multiply both sides of the equation by three, 1 = 0.99999 cycle?
It's different from common sense,

One third = 0.33333 three cycles,
Multiply both sides of the equation by three,
1 = 0.99999 cycle
That's right
This is the relationship between finite and infinite. In high school, you can have the summation of infinite proportional sequence to prove it