Find the maximum value of the quadratic function y = - X's Square - 4x + 4 in - t greater than or equal to x less than or equal to - t + 2 (t is a constant)

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• 1. When x is equal to, the quadratic function y is negative, and the square of X has the maximum value
• 2. It is known that the square of y = - x + 2ax-a + A + 1 has the maximum value 2 when 0 is less than or equal to X and less than or equal to 1
• 3. The minimum value of the square of Y X - 2aX + 1 when x is less than or equal to 1 and greater than or equal to 0
• 4. What is the sum of all the elements in the set of the equations X & # 178; - 5x + 6 = 0 and X & # 178; - 6x + 9 = 0?
• 5. It is known that Tan α and Tan (π 4 - α) are two roots of the equation AX2 + BX + C = 0, then the relation of a, B and C is () A. b=a+cB. 2b=a+cC. c=b+aD. c=ab
• 6. 99,7 Tana and two roots of the equation AX ^ 2 + BX + C on Tan (π / 4-A) Two roots of the equation AX ^ 2 + BX + C on Tana and Tan (π / 4-A), then the relation of ABC
• 7. Cos (x + y) = 3 / 5, cos (x minus y) = 4 / 5
• 8. The value of (1-tanx) (1-tany) if x + y = 3 / 4
• 9. The equation MX2 + 2 (M + 3) x + 2m + 14 = 0 of X has two different real roots, one of which is greater than 4 and the other is less than 4
• 10. This paper discusses the root of the equation (M-3) x2-2 (M + 1) x + m + 1 = 0
• 11. It is known that there are three points a (x1, Y1) and B (X2, Y2) on the image of quadratic function y = - 3x ^ 2 + 6x + K. if | x1-1 | < | x2-1 |, then the corresponding function values Y1 and Y2 have the size relationship
• 12. The image of the quadratic function Y1 = AX2 + BX + C and y2 = KX + B intersects in the x value range of a (- 2,4) B (8,2) which makes Y1 > Y2 hold Before 22:20 Before 22:30
• 13. Given the function y = (M & # 178; - M) x & # 178; + MX + (M + 1) (M is a constant), when m is a value, 1. The function is a linear function 2. The function is a quadratic function
• 14. It is known that the images of the linear functions Y1 = 2x + A and y2 = - x + B pass through the points a [- 2,0], and intersect with the Y axis at two points B.C It is known that the images of the first-order functions Y1 = 2x + A and y2 = - x + B pass through the points a [- 2,0], and intersect with the Y axis at two points B.C. (1) find the values of a and B; (2) draw the images of the two first-order functions in the same plane rectangular coordinate system; (3) find the area of △ ABC
• 15. If there are three points (- 4, Y1), (- 5, Y2), (- 6, Y3) on the parabola y = x2-4x + m, then the size relation of Y1, Y2, Y3 is () A. Y1 ＞ Y2 ＞ y3b. Y1 ＜ Y2 ＜ y3c. Y1 ＞ Y3 ＞ Y2D
• 16. It is known that the shape and size of the image of the quadratic function y = a (x + m) &# 178; + k are the same as the parabola y = - 1 / 2 (x-4) &# 178, And the vertex of the image is just the intersection of the line y = 3 / 2X-4 and y = - 2x, so we can find the analytic expression of the quadratic function
• 17. ① Given that points a (x1, Y1) and B (X2, Y2) are on the image with inverse scale function y = 4 / x, if X1 > X2, try to compare the sizes of Y1 and Y2 ② The inverse scale function y = K / X (K ≠ 0) is known. When x ＞ 0, y increases with the increase of X. the quadrant of the image of the first-order function y = kx-k is calculated
• 18. There are two points (x1, Y1) and (X2, Y2) on the image with inverse scale function y = K + 1 of X, if x1
• 19. It is known that a (x1, Y2) and B (X2, Y2) are on the function image of y = 6 / X if x1x2 = - 3, y2y2y2=_____
• 20. It is known that a (x1, Y1), B (X2, Y2) are all on the image of y = 6 / X. if x1x2 = - 3, then the value of y1y2 is————