How many meters is three Zhang

One meter is three feet, one battle is ten feet

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1. Calculate | quarter to half | + | sixth to quarter | + | eighth to sixth | + · + | 208 to 206
2. Wang Zhuang's weight is 39 kg. How many kg does his blood contain?
3. 40% of a number is 0.5 more than 1 / 3 of it. How to find this number
4. The reciprocal of the product of two continuous natural numbers divided by their difference is 1 / 56. These two natural numbers are ()
5. Find the range y = (5-x) of (3x-9) (6 ≤ x ≤ 7) How to draw a picture? Or tell me how to turn the above formula into a general inverse proportion formula, such as (x + #)#+#
6. Number reasoning, the most difficult problem in the world
7. It is known that the sum of the first n terms of the sequence {an} is Sn, and A1 = 1, an + 1 = half times Sn (n = 1.2.3.) (1) find the general formula of the sequence {an} (2) When BN = log 3 / 2 (3an + 1), prove: the sum of the first n terms of the sequence {BN * BN + 1 / 1}, TN = 1 + n / n
8. 7 / 8 of a number is 14. What's 5 / 32 of this number? (solve the equation)
9. Let a random variable m have a symmetric density function f (x), that is, f (x) = f (- x)|
10. Find the rule: 2, 3, 5, 7, 11, 13, x, 19, 23, 29, what is x? A17 B15 C19
11. Solving an absolute value inequality Inequality: x|x-a| - 2
12. Simple operation of 1 / 2 × 11 / 20 + 1 / 2 △ 20 / 49
13. Simplification: 2 | x | - 3x / | - 2x - | - 5x | - x + 5 | + | - 2x-3 | - 3 + | - 2 - | - 1 + X|||
14. What fraction of 8 = 5 / 10 = () divided by 4 = 360 divided by () = what fraction of 1?
15. The monotone increasing interval of function f (x) = 2x ^ 3-3x ^ 2-36x + 16 is?
16. (1+1/15)+(3+1/35)+(5+1/63)+(7+1/99)+(9+1/143)+(11+1/195)
17. Using formula method to solve equation; 2x (X-2) = (x + 1) (x-1)
18. Calculation: 30.26 degree=____ °____ ′____ 〃 18°15′36〃 =____ __ ° How to figure out... Please give me a clear idea
19. The general solution of the differential equation y '- 3 / xy = x to the power of 3 and e to the power of X To be specific,
20. The quotient is 14 and the remainder is 6. The sum of the divisor and the divisor is 126. What are the divisor and the divisor