How much is it from 1 to 100?

（1+100）+（2+99）+…… （50+51）=101x50=5050

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1. 1 square meter = 100 square decimeter______ (judge right or wrong)
2. 1 square + 2 square + 3 square + 4 square. + 100 square =?
3. Square of 1 - square of 2 + square of 3 - ····· + square of 100 - square of 101 Important this kind of question solution mentality, had better give me more this kind of question to do
4. Given the first n terms of sequence {an} and Sn = an2 + BN (a, B ∈ R), and S25 = 100, then A12 + A14 equals () A. 16b. 8C. 4D. Uncertainty
5. Are there constants a, B, C such that (1 / N) ^ 3 + (2 / N) ^ 3 + +(n / N) ^ 3 = (an ^ 2 + BN + C) / N holds for all n belonging to n *, find out the value of a, B, C and prove it
6. In △ ABC, D, e and F are the middle points of the three sides respectively, and the area of △ DEF is 4cm & sup2;, so the area of △ ABC can be calculated
7. It is known that a · B · C is the three sides of △ ABC and satisfies the equation A & sup2; + B & sup2; + C & sup2; - AB AC BC = 0 Prove that △ ABC is an equilateral triangle
8. It is known that the three sides of △ ABC are a, B, C respectively, and | B + C-2A | + (B + C-5) 2 = 0. The value range of B is obtained
9. It is known that in △ ABC, trilateral a, B, C satisfy the equation A & sup2; - 16b & sup2; - C & sup2; + 6ab + 10bc = 0, and prove that a + C = 2B
10. The square of 1 + 1 / 2 + 1 / 2 + the third power of 1 / 2 +100th power of 1 / 2 = (process)
11. How much is it from 1 to 100?
12. How many square decimeters per square meter
13. (1) 2 square meters=______ Square decimeter (2) 5 square decimeter=______ Square centimeter (3) 400 square decimeter=______ Square meters (4) 900 square centimeters=______ Square decimeter (5) 1 square meter=______ Square decimeter=______ Square centimeter (6)______ Square meter = 600 square decimeter=______ Square centimeter
14. The square of one hundred plus one reduces to the square of one
15. What is the quadratic power of (a + b) + 2 (a + b) + 1 To write out the calculation process, what operations are used, we should use the formula method
16. When calculating the value of the square of 1 + 3 + 3 and the cube of 3 to the 100th power of.. + 3, let s = the square of 1 + 3 + 3 and the 100th power of.. + 3 1: Then 3S = 3 + 3 square + 3 100th power +... + 3 101st power 2: - 1: get 2S = 3 101st power - 1, s = 3 101st power - 1 difference divided by 2. Try to use the above method to find 1 + 8 + 8 square +... + 8 2012 power value, and find 1 + X + x square +... X n power (x is not equal to 1)
17. What is the power of (x-3y + 1)?
18. What is (2 + 4 + 6 + 8 + ····· + 100) - (1 + 3 + 5 + 7 + ······ + 99) equal to
19. 1 + 2 + 3 + 4 + 5. How much does it equal to 100?
20. At 1, 2, 3 , 200620072008, add "+" or "-" arbitrarily before, and calculate in order. Can the sum of these numbers be equal to 2008?