Ask a math question in the second year of junior high school, and it is difficult for those with ext

The decimal part of the root number 2 is a wireless non-cyclic decimal and cannot be written, just like pi.

But the root number 2 is about equal to this, you have to know).

Then remove the integer part (isn't the remainder the decimal part?)

So the decimal part of root number 2 has a value of root number 2 -1

The square of this number.

Root No. 2 -1) 2

2-2 times the root number 2 +1

3-2 times the root number 2

The root number 2 is approximately equal to.

Then the root number 2 is 2 squares.

Finding the square of the root number 2 is 2

Answer: 2

is equal to (root number 2-1) squared.

Root number 2=

Write the decimal part value of the root number 2 and find the square of this value.

!Urgent! I'm sorry I didn't understand.

Is it the square that you are looking for?

The square is equal to.

I don't know if it's right.

Personally, I think it's 1,225,000m

First of all, set up the special line X

350 km/h is three times the speed of a regular bus, so the speed of an ordinary bus is 350 3 km/h.

s=vtt=s/v

3x/350-x/350=7

Get x = 1225km

Answer:.. The special line is 1225000m

High-speed hours, ordinary hours. Kilometer.

Since it is three times the speed of ordinary buses, and it is 7 hours shorter than ordinary buses, it means that it takes hours, and the speed is 350 kilometers per hour, so the special line is 350 * kilometers.

175 km vt=s (general passenger) =3v(t-7)=s (high-speed rail) t=21 2 and 3v=350 vt=175

Solution: (1) Set A type car X yuan per vehicle, B type Y yuan per vehicle.

Get: 10x+15y=300

8x+18y=300

The solution is x=15

y=10A: 150,000 yuan per car for model A and 100,000 yuan for model B car.

2) Set up and buy X cars of type A and cars (30-x) of type B.

Get: 15x+10(30-x) 400

Solution: 18 x 20

x When x=18, (30-x)=30-18=12 (vehicles) make a profit of 180,000 yuan).

When x=19, (30-x)=30-19=11 (vehicles) make a profit of 190,000 yuan).

When x=20, (30-x)=30-20=10 (vehicles) make a profit of 200,000 yuan at this time).

Answer: There are three car purchase plans, with a profit of 10,000 yuan, 10,000 yuan, and 210,000 yuan respectively.

It's all answered by yourself, typed word by word, cherish it! The format is all there!

Needless to say thank you!

If there's something wrong, I'll not live!

(1) Let the ** of A be x and the ** of B be y, and the unit is 11x + 15y = 300 yuan

8x+18y=300

Solution: x=y=10,000 yuan.

2) The profit of car A is 8000, and the profit of buying 30 cars in A is: 30 * 8000 = 240,000, and the car ** is:

10,000, nor more than 4 million. Such profits are maximum.

Yes or no, adopt.

A is not 11, 110 is too exaggerated.

Answer: The 9 yuan spent per person already includes the 2 yuan hidden by the waiter (i.e. ***25 yuan + 2 yuan hidden by the waiter = 27 yuan = 3 * 9 yuan) Therefore, when calculating the composition of the 30 yuan, the 2 yuan hidden by the waiter should not be counted, but the 1 yuan returned to each person should be added. Namely:

3 * 9 + 3 * 1 = 30 yuan is just right! Think about it another way. The three people paid a total of 30 yuan, spent 25 yuan, and the waiter hid 2 yuan, so each person spent 9 yuan, plus the 1 yuan they shared, it was exactly 30 yuan.

So the dollar was found.

Summary: This question confuses people mainly because it separates the 2 yuan from the 27 yuan, and the algorithm of the original question mistakenly believes that the 2 yuan left by the waiter is not included in the 27 yuan, so there is an error result of 1 yuan less; In fact, the 2 yuan left without permission was included in the 27 yuan, plus the 3 yuan returned, and the result was exactly 30 yuan.

I'm speechless, I understand what the topic is about! The three of them paid a total of 27 yuan, the waiter was greedy for 2 yuan, and there was one yuan as the boss!!

Dizzy, it's not a math problem, it's a brain teaser! 27 yuan is the money deducted by the waiter of 25 + 2 yuan for accommodation

It's not right for him to calculate like this, we should calculate it this way, these three people paid a total of 27 yuan, and the boss charged 25 yuan + 2 yuan hidden by the waiter = 27 yuan, so it's right!!

Expenditure: 9 yuan = 27 yuan per person for three people.

Income: 25 yuan for the boss + 2 yuan for the waiter = 27 yuan.

Figure out who pays and who earns, and you'll be even.

If each person pays 10 yuan and returns 1 yuan, a total of 3 * (10-1) = 27 yuan will be paid.

The waiter took 2 yuan.

The remaining $25 was used to pay for the accommodation.