Sum: 1-2 + 3-4 + 5 +（2n-1）-2n= Sum: 1-2 + 3-4 + 5 +（2n-1）-2n=

=（1-2）+（3-4）+.+（2n-1-2n）=-n

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1. Design an algorithm to find all such three digits, which are equal to the sum of the cubes of its digits. Use QBASIC program to solve Design an algorithm to find all such three digits. These three digits are equal to the sum of cubes n=100 x=1 y=0 i=0 Do IF n=x^3+y^3+i^3 THEN PRINT n END IF n=n+1 i=i+1 IF i>9 THEN i=0 y=y+1 END IF IF y>9 THEN y=0 x=x+1 END IF LOOP UNTIL n>=1000 END
2. How much is minus three minus five
3. Judge whether a number is palindrome number or not?
4. Sequence summation, limit value p = 1 / 4 + 2 / 8 + 3 / 16 + 4 / 32 +. + n / [the (n + 1) power of 2] P = 1 / 4 + 2 / 8 + 3 / 16 + 4 / 32 +. + n / [the (n + 1) power of 2] Find the simplest expression of P and the limit value of P
5. A three digit number is the sum of its digits plus the cubic sum of its digits It seems that none of you can see the sum of your numbers + the cubic sum of your numbers
6. How much is minus 5 minus 65?
7. Java to determine a number of digits and whether it is palindrome number
8. Sequence summation ∑ (2 / 7 ^ N-5 / 2 ^ n), (that is to sum 2 / N of 7 minus 5 / N of 2) ∑（2/7^n-5/2^n)=（2/7+2/7^1+2/7^3.+2/7^n)-(5/2+5/2^2+5/2^3+.5/2^n)= 1/3[1-(1/7)^n]-5[1-(1/2)^n]=1/3-5 What is the sum formula? What is the formula? Where do the 1 / 3 and 5 come from?
9. How much is minus 8 minus 15 plus minus 9 minus 12?
10. Proof: the product of four consecutive integers plus 1 is the square of an integer
11. Palindrome number, for example, to multiply 77 by 78 equals 6006. I also need a formula,
12. How much is one tenth minus 11 and one fifth
13. A three digit minus the sum of its digits, the difference 46a is still a three digit, try to find the number a =?
14. Sum (2-3 * 5 ^ - 1) + (4-3 * 5 ^ - 2) +... + (2n-3 * 5 ^ - n) As the title I don't know if I wrote the wrong question. Can the last n be equal to 71? If I wait, the answer is much better? Wrong, the last negative n can be changed to 71? ..
15. In integers, there are a number of symmetric numbers, such as 779395115, which are called palindromes
16. How much is minus one minus one? Such as the title
17. A three digit minus the sum of its digits, the difference is still a three digit 38a?
18. Sum 1 / 2 + 3 / 4 + 5 / 8 +. + (2n-1 / 2)
19. In integers, there are a number of symmetric numbers, such as 779395115, which are palindromic numbers. Please help me write some examples,
20. If you remove 28, 42 and 56 with an input, you can exactly divide them. The maximum number is