Binary linear equation 2 / x + 3 / y = 2 / 13, 3 / x-4 / y = 2 / 3

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• 1. We can find the equation when y = 360, x = 4; when y = 50, x = 2; when y = 1, x = 1 If there is a general solution, it is best
• 2. How to solve the system of equations x (4 / 5 y) = 360 y (x + 3) = 480? x（4/5 y）=360 y（x+3）=480 How to solve this system of equations?
• 3. Is 5 (x + y) = 7 (x + y) a quadratic equation of two variables
• 4. Please write a quadratic equation of two variables so that x = 1, y = 2, x = - 7 and y = - 3 are its two solutions. This equation is_______
• 5. How to solve the quadratic equation x / 3-y / 4 = 1 x / 2-y / 3 = 2
• 6. Bivariate linear equations of two parts x-three parts y = 1 and three parts x + y = two parts y
• 7. It is known that {x = 1, y = - 1 and {x = 2, y = 3 are two solutions of the binary linear equation about X, Y. to solve this equation
• 8. It is known that x = 1, y = 1 and x = 2, y = - 3 are the solutions of the quadratic equation with respect to X and y, then the equation is:
• 9. It is known that the two solutions of the binary linear equation are x = - 1, y = 1 and x = 1, y = 4
• 10. The quadratic equations of 5x-3y = 4 and 2x + 3Y = 3
• 11. Is x (y + 1) = y (X-2) + 8 a quadratic equation of two variables
• 12. Bivariate linear equation {x + y = 3, X-Y = 2
• 13. Solve the equations 4 (x − y − 1) = 3 (1 − y) − 2x2 + Y3 = 2
• 14. Solving the bivariate linear equation {3 (x + y) - 4 (X-Y) = - 9 x + Y / 2 + X-Y / 6 = 1
• 15. How to solve the quadratic equation x / 4 + Y / 3 = 4 / 3 5 (X-9) = 6 (Y-2) Be clear
• 16. {X / 4 + Y / 3 = 4 / 3,5 (X-9) = 6 (Y-2) (quadratic equation)
• 17. If (A-3) x + y | a | - 2 = 9 is a quadratic equation with respect to x, y, then a=______ ．
• 18. In the quadratic equation 2x-y = 4, when x = 5, what is y equal to
• 19. First simplify, then evaluate: (x ^ 2-y ^ 2 / XY) / (x + y) times (x / X-Y) ^ 3, where x = - 1 / 2, y = - 1
• 20. Simplified evaluation: (XY ^ - 1-x ^ - 1y) / (x ^ - 1 + y ^ - 1), where x = 2, y = - 1