How much is 1 + 1 / 2-5 / 6 + 7 / 12-9 / 20 + 11 / 30-13 / 42 + 15 / 56-17 / 72, Please explain clearly, children should be able to understand

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• 1. On the derivation of higher numbers Find the value of F (x) = LIM (n tends to infinity) x (1-x ^ 2n) / (1 + x ^ 2n)
• 2. 5... 5... 5... 1 use addition, subtraction, multiplication, division to calculate the number is equal to 24? And a number can only be used once! /
• 3. Limit of higher number Find Lim [x-x ^ 2ln (1 + 1 / x)] and X tends to infinity
• 4. How do you calculate that three 5S and one 1 are equal to 24
• 5. Thank you for your reply LIM (radical under (2x + 1) - 3) / (radical under (X-2) - radical 2) (x tends to 40) X tends to four
• 6. The mixed operation of addition and subtraction of the four numbers 7 7 3 - 3 is equal to 24, and a number can be asked for help once
• 7. Help to do a high number to find the limit According to the description, please write down two very simple ways to find the limit: LIM (x tends to 2) (x ^ 2-4) / (x ^ 2-3x + 2) and lim (x tends to infinity) (2x-3) (3x + 5) (4x-6) / (3x ^ 2 + x-1). The answers are - two fourths of the root sign and 8 respectively
• 8. What's the difference between 5 / 54 of 8 minus 18 divided by 4
• 9. On the left and right limits of higher numbers First, for example, greater than a is equal to an equation, less than a is equal to an equation, equal to a is a number, and then calculate the limit of the two equations less than and greater than a to make them equal Or can't we make the limits of the three formulas greater than a, less than a and equal to a equal?
• 10. What is 10000 times 2.7 times 3
• 11. Derivation of higher numbers Y = ln (x + radical x ^ 2 + A ^ 2) Why not take 2x in the first step?
• 12. Given 1 + 2 + 3 ····· + 31 + 32 + 33 = 17 times 33, find the value of 1-3 + 2-6 + 3-9 + ······· + 31-93 + 32-96 + 33-99,
• 13. A derivation problem in Higher Mathematics Y = 1 + xsiny, please help me, and try to be more detailed,
• 14. 3 / 17 × 3 / 4 + 36 / 17 × 75% minus 0.75 plus 12 / 17 ／ 4 / 3=
• 15. A problem of derivation of higher numbers y‘=(x+xy')/xy One is direct derivation on both sides, and the other is multiplication of XY to the left. Why are the results different I'll get extra points if you understand me
• 16. How much is 101.1 minus 25 minus 12.5 plus 70 minus 17.2 minus 12
• 17. Find the limit of Tan Π X / 1-x when the present tends to 1,
• 18. 2 / 3 of a number is equal to 20% of 90
• 19. The sum of 3 / 10 and 1 / 5 is equivalent to 4 / 5 of a number. What is the number
• 20. The limit of (Tan x-x) / (x ^ 2 Tan x) when x approaches 0