Math interest questions, what are the math interest questions?

1.Set two price reductions to x

125（1-x）（1-x）=80

x1 = 1 5 x2 = 9 5 (rounded).

So the price is reduced by 20%.

Bag. 100t=100000kg

100000 50 = 2000 bags.

So it is 50 * 3 = 50 3 ( is the root number ).

1) Column formula 125*(1-x) 2 = 80, calculate x=20%2) The total number of bags is 100*1000 50=2000 bags, 3% = 60 bags, and 5 bags are unqualified, so the pass rate is 1-5 60=

3) Draw a triangle, using the right-angled edge relationship, under the root number ((100 2) 2 + (200-50 root number 3) 2).

If you have learned the angular cosine theorem, you can get it directly. The key is to draw the right triangles.

1）125（1-x)^2=80

1-x)^2=16/25

1-x=4/5

x = tons = 100,000 kg.

100000 50 = 2000 bags.

2000* bags.

3) The third question is difficult to explain.

100 root No. 3

1 Let the two markdowns be x 80 times (1+x) squared by 125 x=

2 Produce 100 tons per day 50 kg per bag 2000 bags per day 3% is 60 bags 5 bags are unqualified, so there are 55 bags qualified, and the pass rate is 11/12

3 (draw the picture below) is a right triangle with an atenuse of 200 meters and an angle of 30°, which can be obtained as 100 roots and 3 meters according to cos60° = 1/2.

This is an extremely classic mathematical puzzle "Nine Directions", rest assured, it is definitely not difficult, but it is not easy (almost impossible) to do. Nine square set.

There is an ancient temple on the mountain, 3 monks for a bowl of rice, 4 monks for a bowl of soup, a total of 364 bowls, how many monks.

A, B and C live in the hotel, and each person pays 10 yuan, so a total of 30 yuan is paid. Later, the boss asked the waiter to return 5 yuan to them, and the waiter took 2 yuan from it, and only returned 3 yuan to them, so A, B and C only returned 9 yuan each. Ask A, B and C a total of 9 + 9 + 9 = 27 yuan, plus the 2 yuan taken by the waiter, a total of 29 yuan, and 1 yuan there.

Which of the characters "口, 中, 日, 目, 田, 甲, by , and 申" can be written in one stroke. (One-stroke painting knowledge).

For the one who bought shoes, Master Wang was determined to lose 40 + 65 = 105 yuan, for the neighbors, the account was calculated like this, in exchange for the 100 yuan, 65 were directly given to the one who bought shoes, and he had already calculated that he had 35 yuan of real money left, and at this time he had to make up another 65 yuan of real money to make up enough 100 yuan to give his neighbor, and he lost 65 yuan, a total of 40 + 65 + 65 = 170 yuan.

Let's say you have a ship.

So how old are you?

It's simple. I'm going to turn a corner.

This one is very simple, stupid copy, the first one is a brain teaser problem, not an arithmetic problem at all. Second, the question is: What if you have.

Then ask the captain how old he is. So the answer is obvious, how old are you, and the answer is how old you are. Your answer is 24 years old, which means that you are 24 years old.

Hehe, I've been bothered by this question before, ......

Let us run x meters, x 100 = 1000 (60 + 40), and solve, x = 1000 meters.

Help me...

Hello 100 stars:

Solution: Let the two meet each other after X minutes.

60＋40）×x＝1000

100x＝1000

x 10 dogs ran away:

10 100 1000 (m) 1 (blind age to Garrowfinch Meter).

Solution: Let's say A and B meet after walking for x minutes, according to the question.

60+40）x=1000

100x=1000

x = 10 The time it takes for A and B to meet, and the lack of filial piety is the time for the dog to run, and the dog runs for 10 minutes.

100 10 1000 (m).

1000 m = 1 km.

A: The dog ran a total of 1 km.

Number of people: [16*(1 2)+4] (9-7)=6 people.

Silver taels: 6 * 7 + 4 = 46 taels = 2 catties and 10 taels.

7*n+4=a

9*n-8=a

where n is the number of people, a is the total number of money, simultaneous equations, the number of people is 6, the number of money is 46, it's not wrong, it's so simple!

It takes (9 3) (3 1) 1 = 4 days for the turtle to climb to the wellhead.

The snail is 9 (4 1) = 4 meters from the wellhead.