Who can recite Pi

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• 8. If the distance between the parallel lines is 12cm and the length of the needle is 5cm, the clothing needle can be thrown randomly. What is the probability of the intersection of the needle and the parallel line?
• 9. In the Pufeng needle throwing test, the distance between parallel lines a, needle length B, try to find the relationship between the probability of intersection of needle and line and a, B, and find out under what condition the probability is 1 / PAI
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• 13. Given that a, B, C and D are equal ratio sequences with common ratio 2, then 2A + B2C + D = () A. 1B. 12C. 14D. 18
• 14. Given that a, B, C and D are equal ratio sequences with common ratio 2, then 2A + B2C + D = () A. 1B. 12C. 14D. 18
• 15. Given that a, B, C and D are equal ratio sequences with 2 as common ratio, what is (2a + b) / (2C + D)?
• 16. It is known that a, B, C and D are equal ratio sequence with common ratio of 1 / 2, then (2a + b) / (2C + D) =? Process
• 17. Given that the formula ratio of the equal ratio sequence ABCD is 2, then 2A + B / 2C + D is?
• 18. 1. If the positive numbers a, B and C are three sides of the triangle and satisfy a ^ 4 + B ^ 4 + C ^ 4 = a ^ 2B ^ 2 + B ^ 2C ^ 2 + A ^ 2C ^ 2, try to determine the shape of the triangle 2. Decomposition factor A ^ 2 + B ^ 2 + C ^ 2 + 2ab-2ac-2bc 3. Factorization-4z ^ 2 + 4z-1
• 19. If the three sides of a triangle a B C satisfy a Λ 2b-a Λ 2c-ab Λ 2 + AC Λ 2 + B Λ 2C_ BC ∧ 2 = 0, judge the shape of triangle
• 20. It is known that the ternary linear equation 2A + 3b-4z = 8, and Z is expressed by the algebraic formula containing a and B____________