Given the function f (x) = the square of X + ax + 3-A, if f (x) is constant on [- 2,2], find the value range of A

If the opening of F (x) is upward, we only need to calculate the intersection of F (2) < 0 and f (- 2) < 0 at the same time. If the opening of F (x) is upward, we will discuss it in three cases

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1. ∫ (x ^ 2 + y ^ 2 + Z ^ 2) ds, the integral surface is a closed surface enclosed by x ^ 2 + y ^ 2 + Z ^ 2 = a ^ 2 (x ≥ 0, y ≥ 0) and plane x = 0, y = 0
2. Calculate I = ∫ (x + | y |) ds, where ∑ is the surface | x | + | y | + | Z | = 1
3. ∫∫ xdydz + ydzdx + (Z ^ 2-2z) DXDY, where ∑ is the outside of the cone z = root x ^ 2 + y ^ 2 cut by the plane z = 0 and z = 1,
4. Find ∫∫∫ sinzdv, where Ω is surrounded by a cone z = root (x ^ 2 + y ^ 2) and a plane y = π
5. The integral ∫ (x + y) dydz + (y + Z) dzdx + (Z + x) DXDY is calculated by Gauss formula, Where ∑ is the outer part of cylinder x2 + y2 = A2 between 0 ≤ Z ≤ 1
6. Surface integral ∫ (2x + Z) dydz + zdxdy integral region: z = x ^ 2 + y ^ 2 (0
7. Calculate the surface fraction I = ∫∫Σxydydz + 2sinxdxdxdy, where Σ is the lower side of the rotating paraboloid z = x & # 178; + Y & # 178; (0 ≤ Z ≤ 1) Ask for advice
8. Calculate the surface integral ∫ (Z ^ 2 + x) dydz zdxdy, where the integral surface is Z = 1 / 2 (x ^ 2 + y ^ 2) between z = 0 and z = 2 Why is the Gauss theorem positive for a closed surface? (the normal vector of a plane is downward, and the angle between it and the z-axis is obtuse. It should be the lower side. It should be negative by using the Gauss theorem,
9. ∫∫ x ^ 2dydz + y ^ 2dzdx + Z ^ 2dxdy ∑ is the lower side of the finite part of the paraboloid z = x ^ 2 + y ^ 2 cut by the plane z = 1
10. We know that x, y and Z are all positive numbers, and prove that 33 (LX + 1y + 1z) ≤ 1x2 + 1Y2 + 1z2
11. Look at the following formulas: one times three equals one square plus two times twelve times four equals two square plus two times two
12. 2 (a-b) * [(B-A) cubic] cubic
13. What is the rounding of 0.16667
14. tan sin I am a sophomore, want to learn in advance, had better use some graphics to express, write clearly, can let me understand
15. After a piece of ice turns into water, its mass and density remain unchanged
16. Is the function y = xcosx bounded in (negative infinity, positive infinity) and infinite when x approaches positive infinity?
17. What English word asks about time? The answers include "evening, morning" and so on
18. The general solution of differential equation y '= e ^ ysinx
19. How to remember the Chinese meaning of English words
20. 1 in 1997 + 2 in 1997 + 3 in 1997 + 4 in 1997 +. + 1997 in 1997 (simple calculation)