Absolute value of piecewise function in senior one

I don't understand

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1. If f (x) defined on R satisfies f (x + y) = f (x) + F (y) + 2XY (x, y ∈ R), f (1) = 2, then f (- 3) is equal to () A. 2B. 3C. 6D. 9
2. If f (x) defined on R satisfies f (x + y) = f (x) + F (y) + 2XY (x, y ∈ R), f (1) = 2, then f (- 3) is equal to () A. 2B. 3C. 6D. 9
3. If f (x) defined on R satisfies f (x + y) = f (x) + F (y) + 2XY (x, y ∈ R), f (1) = 2, then f (- 3) is equal to () A. 2B. 3C. 6D. 9
4. If the function f (x) defined on R satisfies f (x + y) = f (x) + F (y) + 2XY (x, y belongs to R), f (1) = 2, then f (- 2) is equal to
5. If f (x) defined on R satisfies f (x + y) = f (x) + F (y) + 2XY (x, y ∈ R), f (1) = 2, then f (- 3) is equal to () A. 2B. 3C. 6D. 9
6. Let f (x) = (2x + 3) / (x-1) (x is not equal to 1), the image of function y = g (x) and the image of function y = F-1 (x + 1) be symmetric with respect to the straight line y = x, then G (3) is obtained
7. Given the function f (x) = 2 ^ x + 2 ^ (AX + b), and f (1) = 5 / 2, f (2) = 17 / 4 (1) Find the value of a and B (2) judge the parity of F (x) (3) try to judge the monotonicity of F (x) on [negative infinity, 0] and prove it; (4) find the minimum value of F (x)
8. In the regular tetrahedron ABCD, e and F are the midpoint of AC and CD respectively, and the cosine value of the angle formed by the lines be and AF on the different planes is calculated
9. If the area of the trapezoid is 48 square centimeters and its height is 6 centimeters, and its bottom is 1 centimeter less than twice that of the top, then what is the top and bottom of the trapezoid?
10. If ABC = 1, then the value of AAB + A + 1 + BBC + B + 1 + CCA + C + 1 is () A. 1B. 0C. -1D. -2
11. The picture and drawing method of absolute value function in grade two y=|x| y=2|x| y=-5|x| y=|x+3| y=|x|-4 y=|x+5| y=|x-6| y=-5|x|+3 y=5|x|-3 It's OK to talk about the method. How many can you write~
12. Drawing method of image with absolute value How to draw the image when f (x) has absolute value? How to draw an image with absolute value of independent variable x?
13. Find the value range of the independent variable x in the following functions (1) y = x & # 178; - X-2 (2) y = 3 / 4x-5 (3) y = radical (x + 3) Find the value range of the independent variable x in the following functions (1)y=x²-x-2 (2)y=3/4x-5 (3) Y = radical (x + 3)
14. The range of independent variable X of function y = root 4x-1 / 2 is
15. 6. In the function y = 1 / radical 12-4x, the value range of the independent variable x is? It's a process!
16. Find the value range of independent variable x in the following function y = 4x ^ 2 + 3x-5 Find the value range of the independent variable x in the following functions 1.y =4x^2+3x-5 2.y =(1+2x) / 1+x-6x^2 3.y = √5+3x 4.y =1 / √2x-1
17. In the plane rectangular coordinate system, the image of a function is a line segment AB and ab ∥ X axis. Given that the coordinate of point a is (2. - 1) AB = 5, then the coordinate of point B is?
18. Function y = - x + B when the value range of independent variable x is - 3
19. The product of all real numbers with absolute values less than 3 is () A6 B12 C0 D-6 The process
20. The product of all real numbers whose absolute value is less than 5 is?