Find a general formula of the following sequence 5.50.500.5000

5*10^n-1

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1. General term of sequence A1 = 2, an = [a (n-1) + 1] * [10000 + 10000a (n-1)] / [10000 + 10000a (n-2] to find the general term formula, this, should not be solved... No way to start
2. The sum of all the numbers in the sequence 1,2,3,... 10000? The answer is 180001
3. It costs 6.8 yuan to buy 1000 kg of apples and 3000 kg of grapes. It is known that 1000 kg of apples is twice as much as 2000 kg of grapes. It costs 0.3 yuan. How much is 500 g of apples
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6. The total age of Xiaoming's parents is 82. His father is 2 years older than his mother. What's the age of his father? List the equality between quantities formulation of equation Complete plus reward
7. Xiaoming is 9 years old, his father is 38 years old and his mother is 35 years old. A few years later, the sum of his parents' ages is seven times of Xiaoming's?
8. Xiaoming is 10 years old. The sum of his mother's and father's age is 71 years old. How many years later, their average age is 35 years old
9. This year, Xiaoming is 9 years old, his father is 38 years old, and his mother is 35 years old. A few years later, the sum of the ages of his parents is seven times that of Xiaoming
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11. General term formula of sequence 5,505005000
12. How to use VB to generate 10000 numbers of 1 ~ 10000 randomly, and classify them according to 1 ~ 1000, 1001 ~ 2000, 2001 ~ 3000, 9001 ~ 10000? How to use VB to generate 10000 numbers from 1 to 10000 randomly, and classify them according to 1 ~ 1000, 1001 ~ 2000, 2001 ~ 3000.9001 ~ 10000? Write like this Private Sub Command1_ Click() Cls Dim a(100) Dim n(10) Dim s(10) For i = 1 To 100 a(i) = Int(Rnd() * 100) k = Int(a(i) / 10) + 1 n(k) = n(k) + 1 s(k) = s(k) + a(i) Next For i = 1 To 10 Print n(i), Next Print For i = 1 To 10 Print s(i), Next Print For i = 1 To 10 Print s(i) / n(k), Next Print Print For i = 1 To 100 Print a(i), If i Mod 10 = 0 Then Print End If Next Print Print k,s(k),n(k) End Sub I just found out
13. When x = 1,10100100010000, what are the values of 2x-10 / X and what do you find? If you know how to describe this rule, it's mainly about discovery. I hope some professionals can explain it, It's (2x-10) / X
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15. The annual interest rate of fixed deposit is 4.14% a year. Dad deposits 2000 yuan into the bank for a fixed period of one year. The interest tax is 5%. How much interest can dad get?
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17. Xiaoxing deposits 1000 yuan into the bank for one year, with an annual interest rate of 2.52% (interest tax of 5%). After maturity, how many yuan can he take out of the principal and interest? One more question The ratio of a and B is 10:7, the number of a is more than that of B, and the number of B is less than that of A 3%, wrong number
18. The one-year fixed deposit interest rate is 4.7%, the two-year interest rate is 5.1%, and the interest tax is deducted by 20%. Someone will deposit 1000 yuan for one year and then two years How much is the principal and interest after three years?
19. If you deposit 800 yuan in the bank, the interest tax will be 20%. After one year, you will get 814.4 yuan of principal and after tax interest. What's the annual interest rate of fixed deposit for one year?
20. If 1000 yuan is deposited in the bank for a fixed period of one year, 2052.06 yuan (after tax) will be obtained one year later. What is the annual interest rate of one year's fixed deposit? (the interest tax is 5%)