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There is a column of numbers, arranged according to the following rules: 1, 2, 2, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 7 The 200th number in this column is______ ．
According to the law, let the 200th number be n, then 1 + 2 + 3 + +n-1＜200＜1+2+3+… +n. Therefore, the answer is: 20
Observe the numbers in the following column. Please write down the following three numbers and say what the 200th number is
1,2,3, - 2, - 4, - 6,3,6,9, - 4, - 8, - 12, (), (), the 200th number is ()
The sequence consists of three groups, one is positive (odd), the other is negative (even), and the first number at the beginning of each group is arranged in the order of 1,2,3. The rule of one group is the second number X2, the third number X31 2 (1 * 2) 3 (1 * 3) - 2 - 4 (- 2 * 2) - 6 (- 2 * 3) 36 (3 * 2) 9 (3 * 3) - 4 - 8 (- 4 * 2)
RELATED INFORMATIONS
- 1. 1, 2, negative 3, 1, negative 4, 5, 6, negative 7 -3，-4，-7，_______ (2014)
- 2. Choose three numbers from 1, 2, 3, 4, 5, 6, 7, 8, 9 and make their sum odd. How many different choices are there? I heard students say: it seems that there is a formula to calculate this, but I don't know what it is So please help me to be complete. If it's good, add more wealth reward value. (it must be understood by children)!
- 3. 7.6 × 201.3 + 4.3 × 201.3-2013 × 0.19 (simple calculation)
- 4. How much is 25 / 3 times 12 / 5? How to calculate?
- 5. 9.6*89/1993+1103*24/25*1993
- 6. 96 times 19 / 93 and 3 / 5 times 7 plus 0.6 times 4-3 / 5
- 7. What's the product of two-thirds minus one-quarter difference multiplied by the reciprocal of twenty-one?
- 8. How can five fourths times nine eleven plus thirteen fourths times five eleven be easily calculated? Five minutes, quick! And three quarters by one fifth plus three quarters by two fifths plus 0.75 by three fifths minus three fourths
- 9. 72 * 72 + 72 + 72 * 27 * 72 by simple method
- 10. A simple method of 1.28 * 0.59-0.28 * 0.59
- 11. Fill in the blanks with the numbers 1,2,3,4,5,6,7,8,9, () - () = () () 1. Each number can only be filled in once and cannot be repeated
- 12. Put the 10 numbers 0,1,2,3,4,5,6,7,8,9 in () (each number can only be used once) () + () = () - () = () * () = () ()
- 13. A ten digit number containing ten digits of 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9 is called a "perfect number". If a "perfect number" satisfies the following requirements: (1) it can be divisible by 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12 respectively; (2) its sum with 2004 can be divisible by 13; then what is the smallest of such "perfect numbers"___ ．
- 14. How to do these two questions? Use a simple method to calculate (1): 57.6 × 1.6 + 28.8 × 36.8-14.4 × 80 How to do these two questions? Calculation by simple method (1):57.6×1.6+28.8×36.8-14.4×80 (2) The fourth power of 39 × 37-13 × 3
- 15. Fill in the brackets with 28.7 divided by () = 478.3 zero point zero zero two Urgent! Quick!
- 16. I'm going to use the formula Romonosov, a famous Russian mathematician, borrowed a book "principles of mathematics" from his neighbor. The neighbor said to him, "help me chop firewood for 10 days. I'll give you the book and give you another 20 rubles. " As a result, he only cut firewood for seven days. After the neighbor gave him the book, he paid five rubles. What is the price of the book "principles of mathematics"?
- 17. The base of a parallelogram is reduced to half of its original size, and its height is increased by six times. The area of the parallelogram is () The bottom of the parallelogram is reduced to half of the original, and the height is increased by 6 times. The area of the parallelogram is ()
- 18. 4 () 4 () 4 () 4 = 2 addition, subtraction, multiplication and division in brackets are OK. The result must be 2
- 19. 6 = 4, fill in the appropriate brackets and add, subtract, multiply and divide
- 20. Three questions to remove brackets Question 1: (a-2b) - (C-D) Question 2: the square of x-3 (X-2) Question 3: the square of a - (a-b + C)