Why do humans have a special liking for the moon

Why do humans have a special liking for the moon

1. The reason why we are fond of the moon is that: (1) the moon can receive abundant solar energy; (2) the moon is rich in mineral resources, especially nuclear fusion fuel helium-3.2, which can be used; (1) once human beings establish a base on the moon, they can directly use helium-3 as rocket fuel; (2) due to many reasons such as gravity and no wind, etc

5 (Part 2) Chinese practice and test page 16, read and understand the answers to why human beings have a special love for the moon

1. The reason why we are fond of the moon is that: (1) the moon can receive abundant solar energy; (2) the moon is rich in mineral resources, especially nuclear fusion fuel helium-3.2, which can be used; (1) once human beings establish a base on the moon, they can directly use helium-3 as rocket fuel; (2) due to many reasons such as gravity and no wind, etc

Why do humans love the moon? What is the role of the moon as a shield for the earth?

The moon revolves around the earth, forming a protective circle around the earth. When dangerous objects such as meteorites come, they have to pass the moon first. Most of them directly hit the moon, and rarely hit the earth
Also, I suggest you read the book "aliens are on the back of the moon", you will know more about the moon!

5 / 3 vs. 0.21 1.35 vs. 0.75

5 / 3: 0.21
=0.6：0.21
=3：14
Ratio = 3 / 14
1.35：0.75
=135：75
= 27：25
Ratio = 27 / 25

In an arithmetic sequence, the first term is greater than 0, and A2003 + a2004 is greater than 0, and A2003 * a2004 is less than 0

Since A2003 + a2004 is greater than 0, one of the two terms A2003 and a2004 must be greater than 0. Because A2003 * a2004 is less than 0, A2003 is greater than 0 and a2004 is less than 0. Therefore, a2004 is the term with negative first term in the sequence, so n = 2003

The area of a classroom is 87.12 square meters. It is paved with square tiles with side length of 0.6 meters

87.12 / (0.6-178;) = 242 (pieces)

Customs of 56 nationalities

1. Achang: distributed in Yunnan, with a population of more than 27000, mainly engaged in agriculture, handicraft industry is also very developed, especially famous for being good at making long knives. It has its own language

Why sin80 ° cos80 ° = 1 / 2sin160

Double angle sine formula
sin2a=2sinacosa
sinacosa=1/2sin2a

In the handicraft class, Mr. Tang asked the students to cut an isosceles right triangle (as shown in the figure) from one corner of a rectangular paper. What is the area of the remaining part?

15 × 11 - (11-3) × (11-3) △ 2, = 165-8 × 8 △ 2, = 165-32 = 133 (square centimeter). A: the area of the rest is 133 square centimeter

Several proofs of inequality in senior two
1. A, B are positive numbers, a is not equal to B. prove a / radical B + B / radical a > radical a + radical B
2. Radical 3 + 1 / radical 2 > radical 5-2
3. A, B are positive numbers, x, y are real numbers and a + B = 1
Prove that the square of AX + by is greater than or equal to the square of (AX + by)
It seems very troublesome here. It's very clear after writing it down in a notebook
There must be a process, and it's not a difficult topic~

(a/√b +b/√a)-√a-√b
=(a/√b -√b)+(b/√a -√a)
Share all, get all
=(a-b)/√b +(b-a)/√a
=(a-b)/√b -(a-b)/√a
=(a-b)[1/√b -1/√a]
=[(a-b)(√a -√b)]/√(ab) ≥0
Therefore, the conclusion is valid
1/(√3+√2)-(√5-2)
=(√3-√2)-(√5-2)
=(√3+√4)-(√2+√5)
(√3+√4)^2=7+2√12
(√2+√5)^2=7+2√10
(√3+√4)>(√2+√5)
1/(√3+√2)-(√5-2) >0
1/(√3+√2)>√5-2
To prove ax ^ 2 + by ^ 2 > = (AX + by) ^ 2
It is proved that ax ^ 2 + by ^ 2 - (AX + by) ^ 2 > = 0
ax^2+by^2-(ax+by)^2
= ax^2+by^2-(ax)^2-2abxy-(by)^2
= a(1-a)x^2+b(1-b)y^2-2abxy
According to the known a + B = 1
= abx^2+aby^2-2abxy
= ab(x^2-2xy+y^2)
Using the complete square formula
= ab(x-y)^2
∵ a, B are positive numbers, and (X-Y) ^ 2 > = 0
∴ab(x-y)^2 >= 0
Ψ ax ^ 2 + by ^ 2 - (AX + by) ^ 2 > = 0 holds
Ψ ax ^ 2 + by ^ 2 > = (AX + by) ^ 2 holds