Given that vectors a and B satisfy the absolute value (a-b) = 1 and B = (3,4), the value range of absolute value a is to seek the help of the great God

Let C = A-B, then: | C | = | A-B | = 1, a = B + C | a | = | B + C |, and | B | = 5, | B | - | C|

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1. As shown in Fig. 1, in RT △ ABC, ∠ ACB = 90 °, point 0 is the midpoint of BC, D is the upper moving point of AB, extend do to e, and OE = OD, connect CE (1) As shown in Figure 2, if D is the midpoint of AB, please judge the shape of quadrilateral EDAC and explain the reason; (2) as shown in Figure 3, if ∠ a = 60 ° and ∠ BOD = 30 °, is quadrilateral EDAC isosceles trapezoid? Please explain the reason; (3) if AC = 15, ab = 25, please make the location of point D in Figure 4 to minimize the perimeter of the quadrilateral EDAC, please complete the figure and find out the minimum perimeter of the quadrilateral EDAC
2. If the derivative value of the function y = x ^ 4 + ax ^ 2-4 / 3A at x = a is 0, what is the constant a
3. First simplify, then evaluate: (xy-3x ^ 2) - 2 (xy-2x ^ 2-1), where x and y satisfy the condition x + 2 + (Y-1) ^ 2 = 0
4. Solving equations 2A + B = 7 2a-b = 1
5. If the slope of an asymptote of the hyperbola whose center is at the origin and focus is on the coordinate axis is 2 / 7, the eccentricity of the hypohyperbola can be calculated
6. Write a program, (C language) to find the root of the quadratic equation AX + BX + C = 0
7. Use the image of quadratic function to find the square of the approximate root X of the following equation + 5x-3 = 0
8. Using trapezoidal method to calculate the approximate value of definite integral (accurate to 0.0001)
9. Let the left and right focus of the ellipse be F1, F2, and if there is a point P on the ellipse, let ∠ f1pf2 = 90, find the value range of E
10. The range of the square + 2x + 2 of the function y = x + 1 / X is
11. (very simple basic problem) urgent Let x ~ n (5,4), find a such that P {x}
12. If a ∈ {x ᦇ 178; - 2x + a = 0, X ∈ r} find the set of values of real number a
13. How to judge whether a function is symmetrical about the origin (except drawing images)
14. If the function f (x) = x ^ 3-3x ^ 2 + 3x + 1, the center of symmetry of the image is
15. It is known that the image of function f (x) and the image of function H (x) = 1 / 3x ^ 3 + x ^ 2 + 2 are symmetric with respect to a (0,1) (1) Find the analytic expression of F (x); (2) If G (x) = f (x) + ax, and G (x) is an increasing function on (- ∞, + ∞), find the value range of real number a~ Mathematics is not very good. In fact, the first problem is how to find the symmetry of cubic function,
16. Given that the solution of the system of equations 2x + 5Y = 7, ax + 4Y = 6 is a solution of the equation x + y = 12, find the value of A
17. If the solution of the system of equations {x + y = 8m, X-Y = 2m satisfies 2x-5y = 1, the value of M is obtained
18. It is known that y is the inverse proportional function of X, and when x = - 2, y = - 5, the expression of this function and the value range of the independent variable X are obtained
19. Why is x an independent variable and y a dependent variable in a function Why can't we say that x is a dependent variable and Y is an independent variable
20. It is said in the book that y = f (x), X is an independent variable and Y is a dependent variable. If the function is written as y = 5x + 2, then the independent variable is x and the dependent variable is y. if it is written as x = 1 ^ 5y-2 ^ 5, then y is the independent variable and X is the dependent variable?