Have a question? It s hard, it s hard, please hurry

Isn't it all about solving equations in mathematics?

It's time to help the children, hehe, you must study hard.

Question 1: Solution: Set x spiders, dragonflies, and cicadas.

8x+6y+6z=118

x+y+z=18

2y+z=20

Solution: x=5, y=7, z=6.

Question 2: Set chicken x, rabbit y.

x+y=100

4y-2x=28

Solution: x=62, y=38.

Question 3: Set x for 4 points and y for 8 points.

y-x=40

Solution: x=30, y=70

Question 4: There are x tickets in the front row and Y tickets in the back row.

x+y=1050

Solution: x=600, y=450

1. Solve a ternary equation.

Suppose there are x spiders, dragonflies, and cicadas z, then.

x+y+z=18

8x+6y+6z=118

2y+z=20

The solution is x=5, y=6, z=7

2. Binary linear equations.

Let's say there are x chickens, y rabbits.

x+y=100

2x+28=4y

Finally, x=62 and y=38 are solved

3. X is 4 points, and Y is 8 points.

y-x=40

4x+8y=680

Solution x=30, y=70

You give me a death, it's actually as simple as chickens and rabbits in the same cage.

Let's teach you, assuming that all of them are chickens or rabbits, and the number of chickens or rabbits obtained is subtracted from the problem, and the chickens or rabbits are found

Xun represents the wind, and Dui represents Ze.

A set of symbolic symbols in ancient China. Use "one" to represent yang, use "--to represent yin, and use three such symbols to form eight forms, which are called eight trigrams. Each hexagram represents a certain thing.

Qian represents the sky, Kun represents the earth, kan represents water, li represents fire, zhen represents thunder, gen(gèn) represents mountain, 剽 (xùn) represents wind, and dui represents ze. The eight trigrams are matched with each other to obtain sixty-four trigrams, which are used to symbolize various natural phenomena and human phenomena. In traditional Chinese medicine, Bagua refers to the general term for the eight acupuncture points that surround the palm.

Xun represents wind, and Dui represents oceans, rivers, and lakes.

What the Ice Age left behind, would, be related to the climate.

10 yuan to buy 5 bottles, after drinking, there are 5 empty bottles and 5 caps;

4 empty bottles for 2 bottles, 4 caps for 1 bottle, 1 empty bottle and 1 cap left, after drinking, there are 4 empty bottles and 4 caps;

4 empty bottles for 2 bottles, 4 caps for 1 bottle, after drinking, there are 3 empty bottles and 3 caps;

2 empty bottles for 1 bottle, after drinking, there are 2 empty bottles and 4 caps;

2 empty bottles for 1 bottle, 4 caps for 1 bottle, after drinking, there are 2 empty bottles and 2 caps;

2 empty bottles for 1 bottle, after drinking, there are 1 empty bottle and 3 caps;

Borrow 1 bottle, after drinking, there are 2 empty bottles and 4 caps; 2 bottles, 1 bottle back, 1 bottle left to borrow 1 bottle, after 2 bottles are drunk, there are 2 empty bottles and 2 caps; Replace 1 bottle and put it on, there are still 2 caps left;

Borrow 2 bottles, and after drinking, there are 2 empty bottles and 4 caps; Replace 2 bottles and put them on, no more bottles and caps left.

So there are total: 5+3+3+1+2+1+2+2+1+2 20

Buy 5 bottles (with 5 bottles and 5 caps) directly

4 bottles and 4 caps can be exchanged for 3 bottles. (4 bottles and 4 caps) 4 bottles and 4 caps can be exchanged for 3 bottles (3 bottles and 3 caps) and 3 bottles for 1 bottle (2 bottles and 4 caps).

2 bottles and 4 caps for 2 bottles (2 bottles and 2 caps).

2 bottles for 1 bottle (1 bottle body and 3 caps).

Total 5 + 3 + 3 + 1 + 2 + 1 = 15 bottles.

If only you could take credit.

A bottle is available on credit.

2 bottles and 4 caps can be replaced with 2 bottles, but one bottle must be returned.

Yes (1 bottle and 1 cap).

Another bottle on credit. 2 bottles plus 2 bottle caps (2 bottles can be returned), and the remaining 2 bottle caps are related to the two bottles on credit.

2 bottles and 4 caps drank all the parts and went back without anything.

Up to 19 normal 15 bottles.

1. There is 1 kind of incense, which is burned in one hour, how to calculate 45 minutes when it cannot be folded and burned? (For example, 30 minutes is calculated by burning both ends at the same time).

Take two sticks of incense, one lit at both ends, one with only one end, and when the incense that is lit at both ends is extinguished, the other incense stick is lit at the end of the incense that is not lit.

2. There are 6 books, 1 A, 2 B, 3 C, and there are several ways to place the books of the same kind of calendar must be separated. (The two books of the same kind are also not the same).

First, the traces of a, b, and c are separated as a whole, and there are 3 2 1 = 6 methods;

There are 2 ways to rearrange B;

Finally, there are 3 2 1 = 6 methods;

So there are a total of 6 2 6 = 72 methods.