A new operation *, X * y = ax + by-3, is defined for real number X. y, where a and B are constants. If 1 * 2 = 9, (- 3) * 3 = 6, find the value of 2 * (- 7)

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• 1. x²-y/ax-bx+ay-by=?
• 2. (ax+by)²+(ay-bx)²
• 3. （x²+x)²-26(x²+x)+120 ax+ay+bx+by-a-b x²(x²-y²)-72y⁴
• 4. If the real numbers x and y satisfy (X-2) 2 + y2 = 3, then the maximum value of YX is______ ．
• 5. If the real numbers a, B, X and y satisfy ax + by = 3 and ay BX = 5, then the value of (A2 + B2) (x2 + Y2) is______ ．
• 6. If x = − 2Y = 1 is the solution of the system ax + by = 1bx + ay = 7, then the value of (a + b) · (a-b) is () A. -353B. 353C. -16D. 16
• 7. It is known that the solution of the system of equations ax + by = 3bx + ay = 7 is x = 2Y = 1, then the value of a + B is () A. 3B. -3C. 103D. −103
• 8. Given that the solution of the system of equations {ax by = 4, BX + ay = 5 is {x = 2, y = 1, then a + B = ()
• 9. If A-B > 0, then a > B. given A-B > 0, X-Y < 0, compare ax + by and BX + ay If A-B > 0, then a > B. given A-B > 0, X-Y < 0, compare AX = by and BX + ay Urgent excavation, to be handed in tomorrow
• 10. Using the formula method: given a < B, x < y, try to compare the size of AX + by and BX + ay
• 11. For real numbers, a new operation is defined, X * y = ax + by + XY, where a and B are constants, 2 * 1 = 7, (- 3) * 3 = 3, and the value of one third * 6 is obtained
• 12. Given that the maximum value of function f (x) = AXF / x ^ 2 + A is 1 / 2, find the value of real number a It is known that the maximum value of F (x) = ax / x ^ 2 + A is 1 / 2 How to find the value of real number a Second, if f (x) is a decreasing function in the interval (m, 2m-1), find the value range of real number M Finding the maximum and minimum of derivative f '(x) of function f (x)
• 13. Given that inequality 2a-5x > 2x-1 holds for any x ∈ [0,1], then the value range of real number a is? Please provide a variety of solutions
• 14. If the solution set of inequality x + | 2x-1 | < A is φ, then the value set of real number a is___ ．
• 15. Set a = [1,2], B = {x | 2x ^ 2-ax + 1 > 0}, if a ∩ B is not equal to the empty set, then the value range of real number a is? If a is really included in B, then the value range of a is? RT
• 16. What is SGN
• 17. When 0 ℃ ice melts into water, its volume shrinks due to the constant temperature. Why does the intermolecular distance decrease and the internal energy increase?
• 18. The function y = xcosx is () A. Odd function B. even function C. both odd and even D. non odd and non even
• 19. All the English words about musical instruments in volume one to volume two of junior high school There are also words to describe people, appearance, character and so on
• 20. Y '+ y = 3x for general solution of differential equation