Given: x + y = - 9, xy = 5, find the value of √ Y / x + √ X / y

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• 1. Given X / y = 3, what is the value of (x + XY) / y? It's a process
• 2. Let me also ask you a question: given X - xy = 8, XY - y = - 9, find the value of X + Y - 2XY
• 3. Given that the square of X + xy = - 5 and the square of XY + y = 9, what is the value of the square of X + 2XY + y?
• 4. Given x + y = 10, xy = 24, find the value of 2x + 2Y
• 5. If x + y = 10, xy = 24, then x ^ 2 + y ^ 2 =?
• 6. We know that x + y = 10, xy = 24, 2x ^ 2 + 2Y ^ 2=
• 7. Given x + y = 3, xy = - 10, then | X-Y|=
• 8. Given x + y = 3, xy = - 10, find (1) x ^ 2-xy = y ^ 2; (2) X-Y
• 9. If xy = - 3, x + y = - 1 / 3, then the value of X + (xy-4x) - 3Y is (),
• 10. If xy = - 3, x + y = - 1 / 4, then the value of X + (xy-4x) - 3Y is?
• 11. Given (x + y) 2 = 9, (X-Y) 2 = 5, find the value of x 2 + y 2
• 12. Given x + y = 12, xy = 9, x < y, find the value of (x ^ 0.5 - y ^ 0.5) / (x ^ 0.5 + y ^ 0.5) RT
• 13. Given x + y = - 5, xy = 7, find the value of X 2Y + X y2-x-y
• 14. If y = the square of root sign - (x + 1) x + the square of root sign x + 2x + 1, find the value of XY
• 15. When m is an integer, the solutions X and y of the system x + y = m 5x + 3 y = 13 are nonnegative
• 16. It is known that the solution of the system of equations x + y = m 5x + 3Y = 31 about X and Y is nonnegative, and the value of integer m is obtained It's better to speak more clearly, and please use the knowledge of solving inequality in the second semester of junior high school to solve it~
• 17. When m is an integer, the solutions of the equations {x + y = m 5x + 3Y = 13 are all nonnegative?
• 18. It is known that the solutions of X + y = m and 5x + 3Y = 31 are nonnegative, and the value of integer m is obtained Get the value
• 19. To find the general solution of the differential equation y '= (XY + y) / (x + XY), I don't know how to calculate y + ln | y | = x + ln | x | + C This is the answer Ye ^ y = Xe ^ X
• 20. All integer solutions of Diophantine equation 2 (x + y) = XY + 7 are______ ．