Given x + 2Y = 1, find the minimum value of 2 / x + 1 / y

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• 1. If x ^ 2 + y ^ 2 = 4, then the minimum value of x ^ 2 + 2Y is
• 2. If x > 0, Y > 0, and X + 2Y = 4, then the minimum value of 1x + 2Y is 0___ ．
• 3. (Innovation Extension) known {X-Y + 2 > = 0, x + y-4 > = 0,2x-y-5
• 4. Known | x|
• 5. Given | x | ≤ 1, | y | ≤ 1, and u = | x + y | + | y + 1 | + | 2y-x-4 |, what is the sum of the maximum and minimum value of u?
• 6. Let x > 0, Y > 0 and X + 2Y = 1, find the minimum value of (1 / x) + (1 / y) It's a process Please use the basic inequality to solve the problem Because I didn't learn Cauchy's inequality in my freshman year
• 7. If x and y are positive R, 2 / x + 1 / y = 1, then the minimum value of X + 2Y is I know how to do it. Find the easiest one I'm 2Y + x = XY Then use the basic inequality to do
• 8. If x and Y belong to R +, 1 / x + 1 / y = 2, find the minimum value of X + 2Y
• 9. Given that X and Y belong to R + and X + 2Y = 1, find the minimum value of 1 / x + 1 / Y and the value of X and y when the minimum value is obtained
• 10. Let X and Y belong to R, x ^ 2 + 2Y ^ 2 = 6, then the minimum value of X + y is
• 11. Given | X-7 + | y + 13 | = 0, find the value of 3x + 2Y
• 12. On the system of equations x + y = a, 3x-2y = 7, x > y, then what conditions should a satisfy
• 13. According to the rule x △ y = 3x-2y, then x △ (4 △ 1) = 7, find x =? (the four operation rules remain unchanged)
• 14. It is stipulated that x triangle y = 3x-2y, and known that x triangle (4 triangles 1) = 7
• 15. Rule: X △ y = 3x-2y, known x △ 4 △ 1 = 7, find the ratio of X
• 16. If x and y are positive real numbers and xy = x + y + 3, then the minimum value of XY is______ ．
• 17. Let X and y be positive real numbers, xy = 8 + X + y, then the minimum value of XY is
• 18. Find XY with 3x ^ 2 + XY + y = 15
• 19. Ask sat math questions The median of a list of 99 consecutive integers is 60.What is the greatest integer in the list?
• 20. Senior, Beijing Normal University Edition