How much is two-thirds minus one-quarter minus one-quarter?

one-sixth.

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1. 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=（）
2. Sequence 3 / 2,17 / 4,57 / 8161 / 16. The first n terms and Sn
3. You can divide 28 and 56 by a number. What's the maximum number
4. How much is one third minus one fourth?
5. How many four palindromic numbers are there in 3000 to 5000 natural numbers For example, 45543333 are palindromic numbers
6. 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,
7. If you remove 28, 42 and 56 with an input, you can exactly divide them. The maximum number is
8. In integers, there are a number of symmetric numbers, such as 779395115, which are palindromic numbers. Please help me write some examples,
9. Sum 1 / 2 + 3 / 4 + 5 / 8 +. + (2n-1 / 2)
10. A three digit minus the sum of its digits, the difference is still a three digit 38a?
11. 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______ ．
12. Sequence 1 * 1 / 2,2 * 1 / 4,3 * 1 / 8,4 / 1 / 16 for the first n terms and Sn!
13. 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)
14. 22 and 1 / 20 * 1 / 21 22 20/1*21/1
15. 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
16. Find the sum of the first n terms of sequence 1 / 2,1 / 4,1 / 8,1 / 16
17. How many palindromes are there? From small to large, what is the 100th? Please write the analysis process
18. A natural number, whether read from left to right or right to left, is the same. It is called palindrome number. Find the average of all three palindrome numbers
19. There is a palindrome number with six digits. It is still palindrome number after dividing by 95. What is the six digit number
20. The probability of choosing a four digit number is exactly the palindrome number For example, 1111122113312552