The reason why the earth is the only planet in the solar system with living matter External conditions: stable () Internal conditions: the earth () is moderate, and the primitive atmosphere is suitable for organisms after long-term evolution
It's not about geography
Temperature and space are the conditions of stability
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- 1. If P1 * P2 = 4 (Q1 + Q2), it is proved that at least one of the quadratic equations x + P1x + Q1 x = 0 and X + P2 x + Q2 = 0 has real roots Try to be quick,
- 2. Given [xix2 + PX + q = 0] = [2], find P2 + Q2 + PQ
- 3. The problem of factorization. Given (x + x1) (x + x2) = x ^ 2 + 2x-15, and x1 ≥ X2, find the value of x1, x2
- 4. Square of factorization factor M (A-3) + 4 (3-A)
- 5. Let a > 1, then log (0.2) a, the power of 0.2 a, the power of 0.2 a
- 6. Solve the equation AX = B (where a and B are known numbers) There is no mistake in this question
- 7. I'm looking for two math problems in grade one! 1. Find all positive integer solutions of xy-3x-3y + 6 = 0 2. Judge the number of positive solutions of the equation x ^ 3-2x ^ 2 + 2 = 0 by classification discussion Please write down the process clearly!!!!!!!!!!
- 8. It is known that m and N are positive numbers with {MX + NY = mm + NN} nx+my=2mn Note: {MX + NY = + n squared Nx + my = 2Mn is a system of quadratic equations x+y=?
- 9. 1. CP and BP divide ∠ DCA and ∠ abd equally, and try to explain: ∠ P = 1 / 2 (∠ a + ∠ d) 2. In △ ABC, ab = AC, the center line BD on the side of AC divides the perimeter of △ ABC into two parts, 12cm and 15cm, and calculates the length of each side of the triangle 3. In △ ABC, a = ACB, CD is the bisector of ACB, CE ⊥ AB is e (1) Try to explain ∠ CDB = 3 ∠ DCB (2) If ∠ DCE = 48 °, calculate the degree of ∠ ACB 4. In RT △ ABC, ∠ ACB = 90 °, CD is the height on the edge of AB, ab = 13cm, BC = 12cm, AC = 5cm, and find the length of CD 5. In the quadrilateral ABCD, e and F are the midpoint of AD and BC respectively. Given that the area of quadrilateral ABCD is 1, calculate the area of quadrilateral debf There's no way to make a picture. I also want to have a picture, so you can do it. Oh, and, 》OK, I'll try to wait at 8:20.
- 10. Junior one mathematics super problem! It is known that in △ ABC, high be and CF intersect at O, AE = AF, which means ob = OC
- 11. How are satellite stars, solar system, cosmos, planets and galaxies arranged in descending order
- 12. The only star in the solar system is (), and the nearest planet to the sun is ()
- 13. There is a comet in the solar system that returns to the earth once in 76 years. What comet is it?
- 14. Please order: (universe, moon, sun, solar system, galaxy, earth) from small to large, please help me
- 15. As a special planet in the solar system, the earth mainly displays in the following aspects
- 16. When is the moon closest to the earth Who knows
- 17. The mass of the earth is about 81 times that of the moon. When the spacecraft passes through a certain position between the moon and the earth, the gravity of the moon and the earth is equal. The distance ratio from the position to the center of the moon and the center of the earth is () A. 1:81B. 1:27C. 1:9D. 1:3
- 18. The mass of the earth is 81 times that of the moon, and spaceships fly from the earth to the moon The distance between the moon and the earth is 3.84 times 10 to the eighth square meter. It is known that the mass of the earth is about 81 times that of the moon. The spacecraft is attracted by the gravity of the earth and the moon on the way to the moon. When it arrives at a certain area, the resultant force of gravity is equal to zero. How far is this area from the earth
- 19. How long does it take to get to the moon from the earth
- 20. If a man is in a spaceship flying at the speed of light, flying at the speed of light,