If | x − 2Y | + y + 2 = 0, then the value of XY is______ ．

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• 1. Given the absolute value of x-2y + (X-2) to the second power = 0, then xy = what
• 2. It is known that the absolute value of K of the polynomial. XY - 4 / 7 (K-2) y to the second power + 5 is a cubic trinomial of. XY. Find the value of K In class. I didn't listen to the teacher carefully. Please elaborate.
• 3. It is known that the function y = f (x) is a quadratic function, and f (- 3 / 2 + x) = f (- 3 / 2-x), f (- 3 / 2) = 49, and the difference between the two real roots of the equation f (x) = 0 is equal to 7 Finding the analytic expression of quadratic function
• 4. Given that the absolute value of equation x = ax + 1 has a negative root but no positive root, then the value range of a is larger |x|=ax+1 When x > = 0, x = ax + 1, according to the meaning of the problem, the equation has no solution (at this time a = 1), or only negative solution (at this time 1-A = 1) When X-1 Finally, it is concluded that: a > = 1 ———————————————————————————— The question is not to say that there are negative roots but no positive roots. Why does the equation have no solution when a = 1 also count in the answer
• 5. It is known that the equation | x | = ax-a has positive roots and no negative roots, and the value range of a is obtained
• 6. Given that the equation | x | = ax + 1 has a negative root but no positive root, the value range of a is () A. A ≥ 1b. A ＜ 1C. - 1 ＜ a ＜ 1D. A ＞ - 1 and a ≠ 0
• 7. It is known that P and Q are positive integers, and the two roots of the equation 7X2 PX + 2009q = 0 are prime numbers, then p + Q=______ ．
• 8. If M and N are positive integers and the two roots of equation 1 / 2mx ^ 2-1 / 2nx + 1999 = 0 are prime numbers, then 6m ^ 2 + n-1=
• 9. It is known that P and Q are positive integers, and the two roots of the equation 7X2 PX + 2009q = 0 are prime numbers, then p + Q=______ ．
• 10. If both a and B are integers, and the difference of equation AX2 + bx-2008 = 0 is prime, then the value of 3A + B is () A. 100B. 400C. 700D. 1000
• 11. There are several sets of integer solutions to the system of equations 2 (x + 2) = XY + 7
• 12. How many sets of integer solutions of equation 2 (2-x) = XY + 1?
• 13. The nonzero integer solution of the equation "1 / x plus 1 / y minus 1 / 2 of xy = 3 / 4" is_____
• 14. Integer solution (x, y) of equation 1 / x + 1 / Y-1 / XY ^ 2 = 3 / 4=____ Indefinite equation,
• 15. Given the equation x2 + (2-k) x + K-2 = 0 about X, two real number roots are X1 and x2. Is there a constant k such that X1 / x2 + x2 / X1 = 3 / 2? If so, find
• 16. It is known that X1 and X2 are two real roots of the equation x2-2kx + k2-k = 0. Is there a constant k such that x1x2 + x2x1 = 32? If it exists, find out the value of K; if not, explain the reason
• 17. Given that X1 and X2 are the two real roots of the equation x2 + 2 (k-1) x + K2 = 0 about X, is there a constant k such that 1x1 + 1x2 = 32 holds? If it exists, find the value of K; if not, explain the reason
• 18. Given that X1 and X2 are the two roots of the equation 9x & sup2; - (4k-7) x-6k & sup2; = 0 about X, is there a real number k such that the absolute value of X1 / x2 = 3 / 2? If there is, find out the value of K; if not, explain the reason
• 19. Solution of equation 1.5x + 8 / 2 = 19 Shouye, 56 people
• 20. The solution of the equation of 2.5x = 3 (X-8)