It is known that a, B, C are the lengths of three sides of a right triangle, C is the hypotenuse, if point (m, n) Finding the minimum value of M & sup2 + n & sup2 on the line ax + by + 2C = 0 Please answer in detail, thank you Why is the minimum distance to the origin?

It is known that a, B, C are the lengths of three sides of a right triangle, C is the hypotenuse, if point (m, n) Finding the minimum value of M & sup2 + n & sup2 on the line ax + by + 2C = 0 Please answer in detail, thank you Why is the minimum distance to the origin?

It is equal to 4, that is, am + BN + 2C = the square of the minimum distance from 0 to the origin, using the formula a * 0 + b * 0 + 2C | / root sign a square + b square = 2 (a square + b square = C Square)

English antonyms,
hot,warm,down,wet,right,hungry,soft,smooth,old,quiet,sit,those,that,no

hot-cold
warm-cool
down-up
wet-dry
right-left
hungry-full
soft-hard
smooth-rough
old-new
quiet-noisy
sit-stand
those-these
that-this
no-yes

In △ ABC, a triangle is solved according to the following conditions, two of which are
A b=10 A=45°,c=60° B a=6,c=5,B=60°
C a = 7 b = 5 a = 60 d a = 14 b = 16 A = 45

Sine theorem, if a is greater than bsina, a is greater than B, you can know the passing of senior two

Is the original form of an English verb imperative at the beginning of a sentence? How does it begin with the verb "ing"? Please, thank you

The most classic sentence of imperative sentence is let's go, but it doesn't mean that the original form of verb at the beginning of sentence is imperative sentence. Moreover, if a sentence is not imperative sentence, the original form of verb must not be placed at the beginning of sentence (except modal verb). Besides, verbs can start with ing, they can also use ed, to be and so on as adverbials

What is the significance of the concept of critical period in grasping children's psychological development

Critical period
In the critical period, behavior acquisition is particularly easy and develops rapidly under the appropriate environmental impact. However, if there is no appropriate environmental impact at this time, it can also cause pathological reaction and even hinder the normal development in the future, Some researchers call it the sensitive period. They also found that the sensitivity of the body to the environment is low at the beginning and end of the critical period, and the sensitivity is highest in the middle stage. However, if there is no certain influence, it will cause variation in development. The research on the critical period has aroused strong repercussions in educational practice, It promotes the importance of early childhood education. Recent studies have proved that children's childhood has great potential, and the critical period of children's development is mostly in infancy. Therefore, the implementation of early education can give full play to children's learning potential, promote children's psychological development, and is conducive to early talents, Therefore, corresponding to the critical period of children's development, the best period of education is proposed. The introduction of the concept of critical period should be extended to the study of k.z. Lorentz, an Austrian biologist. Lorentz found that chickens and geese are imprinted, The phenomenon of individual imprinting can only occur in a short "critical period" of an individual's life. The object that an individual imprints at this moment can make the individual approach and have a preference for it, and will not be forgotten, thus forming a permanent binding attachment to it, For example, some researchers found that the most vulnerable critical period for human embryos is within six weeks after pregnancy, that is, the period of major organ development. All congenital defects occur in the critical first three months of pregnancy, The critical period of brain development is from 5 to 10 months after birth. In this period, if we neglect or lack of good environmental education, we will damage our development. In addition, we have also raised the issue of critical period for children's language and other aspects of psychological development. Psychology also studies the influence of individual critical period development on future development, If they are deprived of perceptual experience, lack of social communication, neglect of intellectual education or lack of parental care, they will seriously affect the normal psychological development in the future, Take positive educational measures to promote development, rather than waiting for natural development. ③ we should pay attention to the role of critical period in development, but not limited to this; children or adults who miss the critical period can still get good development through appropriate education

What does "plural" mean in mathematics?

Complex number (1) a mathematical noun. A number consisting of real and imaginary parts, such as a + bi. Where a and B are real numbers, I is "imaginary unit", and the square of I is - 1. A and B are called real and imaginary parts of complex number a + bi respectively. When B = 0, a + bi = a is real number; when B ≠ 0, a + bi is also called imaginary number; when B ≠

What is the thinking of solving the problem of the third grade mathematics reduction method

The inverse method is addition, variation, subtraction, addition, multiplication, variation, division, variation and multiplication
For example, a number plus 1 minus 4 equals 9
Nine plus four minus one is twelve

What is the difference between sports and sports?
If we talk about a project, we should say sport or sports
A sport such as volleyball or
A sports such as volleyball

Sport can be used as a noun eg: football is my favorite sport
Or the verb eg: lambs were sporting in the field
Sports can be used as a noun or adjective
Of course, this is a sport such as volleyball, because sport is singular

When a cylinder is cut off for 6cm, the surface area of the cylinder is reduced by 75.36cm2. The height of the cut off cylinder and the height of the original cylinder are 16cm?
Explain the meaning of the expression

After truncation, the side area of the 6 cm long cylinder is reduced by 75.36 △ 6 = 12.56, which is the circumference of the bottom surface of the cylinder, so the diameter of the bottom surface of the cylinder is 12.56 △ 3.14 = 4, and the radius is 4 △ 2 = 2, so the original surface area of the cylinder is 2x2x3.14x2 + 4x3.14x16 = 25.12 + 200.96 = 226.08 square cm

If a and B are natural numbers and a △ B = 2, then their least common multiple is () and the greatest common factor is ()

A △ B = 2 indicates that a is twice of B
Two factors, one of which is a multiple of the other, then their least common multiple is a and the greatest common factor is B