First aid!The steps or methods of the golden section method are how to calculate

When splitting, the split is made at about the full length, and it is called a split, and this split point is called a splitting point.

Divide a line segment into two parts so that the ratio of one part to the total length is equal to the ratio of the other part to this part. The ratio is an irrational number, expressed as a fraction as (5-1) 2, and the approximation of its first three digits is. Because the shape designed according to this ratio is very beautiful, it is called ** division, also known as the ratio of the middle and the middle.

This is a very interesting number, which we have approximated, and can be found by simple calculations:

The role of this value is not only reflected in the art fields such as painting, sculpture, architecture, etc., but also has a non-negligible role in management, engineering design, etc.

Let's start with a sequence of numbers, the first few numbers of which are....The name of this sequence is called"Fibonacci sequence", these numbers are called"Fibonacci number"。The characteristic is that each number is the sum of the first two numbers except the first two numbers (the value is 1).

What does the Fibonacci sequence have to do with the split?It is found that the ratio of the two adjacent Fibonacci numbers gradually tends to the ** division ratio with the increase of the serial number. i.e. f(n) f(n-1)-

Since the Fibonacci numbers are all integers, and the quotient of the division of two integers is a rational number, it is just gradually approaching the irrational number of the **division ratio. But when we continue to calculate the larger Fibonacci number later, we will find that the ratio of the two adjacent numbers is indeed very close to the ** division ratio.

A very illustrative example is the pentagram. The five-pointed star is very beautiful, there are five on our national flag, and many countries also use five-pointed stars in their national flags, why is that?Because the length relationship between all the line segments that can be found in the pentagram is in accordance with the ** division ratio.

All triangles that appear after the diagonal of a regular pentagon is full are divided triangles.

Since the apex angle of the pentagram is 36 degrees, it can also be concluded that the value of the ** segment is 2sin18 degrees.

**The split point is approximately equal to 0 618:1

**The dividing point divides the line segment into the short side and the long side: then the short side: the long side = the long side:

The long side of the whole line segment is x, then the short side is 13-x (13-x): x=x:13 The solution:

x=(-13 plus or minus 13 * root number 5) 2 Because x is a non-negative number, so x=(13*root number 5-13) 2 then x:13=(root number 5-1) 2, approximately equal to.

More than 2,000 years ago, the Platonic scholar Eudox of ancient Greece first used a ruler to divide the known line segments as "** division", and his practice is as follows:

1?Passing the point, making and making 12;

2?Join;

3?Take as the center of the circle, make an arc for the radius, and intersect with ;

4?With is the center of the circle and the radius is the arc intersection line segment at , then the point is divided into **.

It's easy to do and easy to prove.

Let the rule a2, from the Pythagorean theorem:

ac=ab2+bc2=a2+(a2)=52a；

ad=ac-dc=52a-a2=5-12a；

ap=ad=5-12a。

This proves that the point is divided into ** division.

This drawing method is called the "Split Method", and the points are "Split Points".

**Dividing points divide a line segment into short and long sides:

then the short side: long side = long side: the entire line segment.

Let the long side be x, then the short side is 13-x

13-x）：x=x：13

Solution: x=(-13 plus or minus 13 * root number 5) 2

Since x is a non-negative number, then x=(13*root number 5-13) 2 then x:13=(root number 5-1) 2, which is approximately equal to.

Let c be the ** dividing point of the line segment AB, then ac:bc=bc:ab, that is, bc*bc=(ab-bc)*ab, let bc=k*ab, the original formula is ab*ab*(1-k-k*k)=o, that is, k*k+k-1=0, and k is the ** segmentation ratio.

The rescuer stood behind the victim, hugged the victim's abdomen from behind, wrapped his arms around his waist and abdomen, made a fist with one hand, and pressed the center of the fist inward on the area between the victim's navel and ribs; Hold your other hand into a palm over your fist and squeeze your hands inward and upwards with rapid force, repeating until the blockage is spit out.

Tools Ingredients: chairs with backs, tables, etc., steps of the Heimlich maneuver:

1. Babies within one year old, if the baby at this stage is suffocated, the baby should be placed face down on the arm, the arm is close to the chest, and the thumb and the remaining four fingers are stuck in the mandible. The other hand is patted 5 times in the middle of the shoulder blades on the baby's back. Then observe whether the foreign body is spit out.

2. If there is no spitting, immediately turn the baby over, head down and feet up, face to face on the thigh. Fix one hand on the baby's head and neck, stretch out the index finger and middle finger with the other hand, quickly press the middle of the baby's chest, repeat five times, and then turn the child over and repeat step 1. Until the foreign body is expelled.

3. For children over one year old and adults, the rescuer stands behind the rescued person, stretches his arms from behind him to the middle of the navel and ribs, clenches one hand into a fist, and wraps the fist with the other hand, and then quickly and forcefully impacts the inside and upper of the image until the foreign body is discharged.

4. If there is no other person around, how to save yourself, at this time, you can only rely on yourself, and you must race against time while your consciousness is clear. Make a fist with one hand, wrap the other hand, and quickly punch inward and upward into the middle of the navel and ribs. until the foreign body is expelled.

5. If you don't have enough strength, quickly find a chair or table with a backrest. Then press your abdomen against the corner of the table, the back of the chair or other hard object and blow inward and upward, be sure to hit it quickly and accurately, and repeat the impact several times to expel the foreign body.

6. What to do if the asphyxiation patient is unconscious, then the above methods are not applicable. At this time, the patient can be placed face up, the face is tilted to one side, and then the base of the palm of one hand is placed between the navel and the ribs, and the other hand is covered with the palm, and the impact is quickly forward and inward.

Notes:

1. After the child is stuck in the throat by a foreign object, he must avoid picking with his hands, so as not to go in more and more.

2. The sooner the rescue occurs after the suffocation, the better, and the rescue time is only 3 minutes.

Artificial respiration is an important first-aid technique for rescuing patients who have stopped breathing.

A line segment is divided into two sections, the longer is shorter, and the overall is longer than the long.

Principles of on-site ambulance:

1. Rescue first: let the wounded and sick in a dangerous situation get out of danger as soon as possible and move to a safe place before treatment.

2. First severe and then light: For the wounded and sick with heavy bleeding, abnormal breathing, weak pulse or cardiac arrest, and delirium, first aid measures should be taken immediately to save lives. Comatose wounded and sick patients should pay attention to maintaining the patency of the airway.

Wound management should generally stop bleeding, then bandage, then fixation, and transfer to hospital as soon as possible.

3. First rescue and then delivery: All the wounded and sick at the scene need to go through first aid treatment before they can be transferred to the hospital.

The steps of on-site rescue are:

1. On-site assessment and judgment of injury condition.

2. Call for help in time, save lives first, and then treat injuries and diseases.

3. Leave the scene and transfer safely.

Basic principles. Production site first aid refers to the initial emergency rescue measures that should be taken in order to prevent the deterioration of the condition, reduce the patient's pain and prevent shock, also known as pre-hospital first aid, in order to prevent the deterioration of the condition, reduce the patient's pain and prevent shock.

The general task of first aid at the production site is to take timely and effective first aid measures and technologies to minimize the suffering of the wounded and sick, reduce the disability rate, reduce the mortality rate, and lay a good foundation for hospital rescue. The principles that should be followed in the first aid of the scene are:

1) The principle of first recovering and then consolidating.

In case of cardiac and respiratory arrest and fractures, the heart, lungs, and brain should be resuscitated with mouth-to-mouth breathing and chest compressions until the heartbeat and breathing are restored, and then the fracture should be fixed.

2) The principle of stop-first-packing.

In case of heavy bleeding and wounds, the bleeding should be stopped immediately with acupressure, tourniquet or medicine, and then disinfected and bandaged the wound.

3) The principle of priority before lightness.

It means that when there are dying and mild wounded and sick, priority should be given to rescuing the critically ill, and then rescuing the lighter wounded and sick.

4) The principle of first rescue and then luck.

When the wounded or sick are found, they should be rescued first and then transported. On the way to the hospital, do not pause rescue measures, continue to observe the changes of the disease and injury, avoid bumps, pay attention to keeping warm, and arrive at the nearest hospital safely.

5) The principle of paying equal attention to first aid and calling for help.

When encountering a large number of wounded and sick people, and other personnel involved in first aid at the scene, it is necessary to divide labor and cooperate nervously and calmly, and first aid and call for help can be carried out at the same time, so as to strive for rescue more quickly.

6) The principle of consistency between handling and first aid.

When transporting critically injured and sick people, they should be consistent with the first aid work steps, gain time, and carry out rescue work on the way to reduce the undue pain and death of the wounded and sick, and reach the destination safely.

Caution (1) Avoid direct contact with the body fluids of the injured or sick.

2) Use protective gloves and use waterproof tape to cover your own injury.

3) Wash your hands before and after first aid. And once there is blood from the patient's eyes, nose or any ** injury, it should be washed with soap and water as soon as possible and go to the hospital.

4) When performing mouth-to-mouth artificial respiration, try to use an artificial respiration mask.

A method of solving a quadratic equation, also refers to applying a formula to calculate something.

In addition, there are matching methods, cross multiplication, direct leveling methods, and factoring methods. The formula expresses the result of solving a general quadratic equation by the matching method.

According to the relationship between factorization and integer multiplication, the coefficients can be directly brought into the root finding formula, which can avoid the formula process and directly obtain the root, and this method of solving the unary quadratic equation is called the formula method.

1.Equation to a general formula:

2.Determine the discriminant formula and calculate the δ (Greek alphabet, transliterated as Delta).

3.If 0 is δ>, the equation has two unequal real roots in the field of real numbers: ;

If δ=0, the equation has two equal real roots in the real number field:

If δ< 0, the equation has no solution in the field of real numbers, but there are two conjugate roots in the field of imaginary numbers, which are general, equations.

It's called an equation. , usually denoted by the Greek letter δ, ie.

Find a, b, c in the equation The so-called a refers to the coefficient of the quadratic term, b refers to the coefficient of the primary term, and c refers to the constant term. If you bring the number into b 4ac, there are three possibilities, greater than 0 or equal to 0 is the root of the real number, if it is less than 0, the equation has no real root. x b b 4ac 2a must end up with two real roots.

First find abc to calculate the square of b 4ac to see if it is greater than or equal to 0, if not, it is unsolvable, it is best to calculate.