How much is one third minus one fourth?

one-twelfth

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1. How many four palindromic numbers are there in 3000 to 5000 natural numbers For example, 45543333 are palindromic numbers
2. Find the first n terms and Sn of sequence 3 / 2,9 / 4,25 / 8,65 / 16161 / 32 The first n terms and Sn of sequence 3 / 2,9 / 4,25 / 8,65 / 16161 / 32,
3. If you remove 28, 42 and 56 with an input, you can exactly divide them. The maximum number is
4. In integers, there are a number of symmetric numbers, such as 779395115, which are palindromic numbers. Please help me write some examples,
5. Sum 1 / 2 + 3 / 4 + 5 / 8 +. + (2n-1 / 2)
6. A three digit minus the sum of its digits, the difference is still a three digit 38a?
7. How much is minus one minus one? Such as the title
8. In integers, there are a number of symmetric numbers, such as 779395115, which are called palindromes
9. 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? ..
10. A three digit minus the sum of its digits, the difference 46a is still a three digit, try to find the number a =?
11. You can divide 28 and 56 by a number. What's the maximum number
12. Sequence 3 / 2,17 / 4,57 / 8161 / 16. The first n terms and Sn
13. We call the natural numbers with symmetrical arrangement of left and right numbers palindromic numbers, such as 505, 31731 （1）①121=11² ,13 321=111² 1 234 321=（）12 345 654 321=（） ②14 641=（） ③40 804=（ ) ④44 944=（）
14. How much is two-thirds minus one-quarter minus one-quarter?
15. If you divide 28, 42 and 56 by a number, you can divide them exactly. The maximum number is______ All 12, 15 and 20 can divide the same natural number, which is the smallest______ ．
16. Sequence 1 * 1 / 2,2 * 1 / 4,3 * 1 / 8,4 / 1 / 16 for the first n terms and Sn!
17. If a number (the first digit is not zero) is read from left to right as well as from right to left, we call it Title: [noip1999] palindrome number Title Description If a number read from left to right is the same as a number read from right to left, we call it palindrome number For example: given a decimal number 56, add 56 to 65 (that is, read 56 from right to left), and 121 is a palindrome number Another example: for decimal number 87: STEP1：87+78 = 165 STEP2：165+561 = 726 STEP3：726+627 = 1353 STEP4：1353+3531 = 4884 The step here refers to an n-ary addition. In the above example, it takes at least 4 steps to get the palindrome number 4884 Input format The first line is the integer n (2)
18. 22 and 1 / 20 * 1 / 21 22 20/1*21/1
19. The last two digits are 42, the sum of numbers is 42, and what is the smallest of the natural numbers divisible by 42? It's a process
20. Find the sum of the first n terms of sequence 1 / 2,1 / 4,1 / 8,1 / 16