![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
If x is greater than 0, f (x) is greater than 1, f (a + b) = f (a). F (b) It is proved that FX is a proper function on R, a and B belong to R Increasing function
f(0)=f(0)*f(0),
f(0)=1
Let X1 > X2, x1-x2 > 0,
f(x-x)=f(0)=f(x)f(-x)=1
So f (- x) = 1 / F (x)
Because x belongs to [0, positive infinity) f (x) > 1,
So when x belongs to (negative infinity, 0), - x belongs to [0, positive infinity],
f(x)=1/f(-x)>0
f(x1-x2)=f(x1)f(-x2)=f(x1)/f(x2)>1
The results show that f (x1) > F (x2)
So it's an increasing function
RELATED INFORMATIONS
- 1. It is known that the function f (x) is defined as an increasing function f (2) = 1, f (XY) = f (x) + F (y) defined on greater than 0, which solves the inequality f (4) f (X-2) less than or equal to 3
- 2. If the odd function y = f (x), (x is not equal to 0), if x belongs to (0, + ·), f (x) = X-1, find the inequality f (x-1)
- 3. If the odd function y = f (x) (x belongs to R and X does not = 0), when x is 0 to positive infinity, f (x) = X-1, and f (x-1)
- 4. If the odd function y = f (x) (x ≠ 0) is x ∈ (0, + ∞), f (x) = X-1, then the value range of X satisfying the inequality f (x-1) < 0 is obtained
- 5. If the odd function f (x) (x is not equal to o), X belongs to (0, + 00), f (x) = X-1, then the inequality f (x-1) is satisfied
- 6. Given that the function f (x) = x + B (a is greater than 0, a is not equal to 1) satisfies f (x + y) = f (x) f (y) and f (3) = 8 to find f (x)
- 7. The definition field of odd function f (x) is R. when x > 0, f (x) = - x 2x2, then the expression of F on R
- 8. It is known that f (x) is an odd function over R, and if x
- 9. Prove that cosh (3x) = 4 * (coshx) ^ 3 + 3 * coshx
- 10. What is the number of functions whose range is {2,5,10}, where the corresponding relation is y = x ^ 2 + 1 A.1 B.8 C.27 D.39 This is the joint examination of ten schools in Ningbo, Zhejiang Province in 2009
- 11. Given that f (x) is defined as R, for any x, y belongs to R, f (x + y) + F (X-Y) = 2F (x) (y), and f (0) is not equal to 0 If there is a constant C, Let f (C / 2) = 0. Proof: for any x belonging to R, f (x + C) = - f (x)
- 12. It is known that the function f (x) is defined on R, for any x, y belongs to R, f (x + y) + F (X-Y) = 2F (x) f (y), and f (0) is not equal to 0 1, prove that f (0) = 1.2, y = f (x) is even function
- 13. The function f (x) defined on R, for any x, y ∈ R, f (x + y) + F (X-Y) = 2F (x) f (y), and f (0) is not equal to 0, it is proved that f (x) is even function
- 14. Given the function FX = LG (1 + x) / (1-x), find the value range of X which makes FX > 0
- 15. Given the function f (x) = LG (x + 1); (1) if 0 ＜ f (1-2x) - f (x) ＜ 1, find the value range of X; (2) if G (x) is an even function with a period of 2, and if 0 ≤ x ≤ 1, G (x) = f (x), find the analytic expression of the function y = g (x) (x ∈ [- 1,1])
- 16. Given the function f (x) = x2 + (a + 1) x + LG | a + 2 | (a ∈ R, and a ≠ - 2) (I) if f (x) can be expressed as the sum of an odd function g (x) and an even function H (x), find the analytic expressions of G (x) and H (x); (II) proposition p: the function f (x) is an increasing function in the interval [(a + 1) 2, + ∞); proposition q: the function g (x) is a decreasing function. If proposition p and Q have and only one is an increasing function Under the condition of (II), compare the size of F (2) and 3-lg2
- 17. Let f (x) be an odd function defined on R, and the image of y = f (x) is symmetric with respect to x = 1 / 2, f (1) + F (2) + F (3) + F (4) + F (5)=
- 18. It is known that f (x) is an odd function on R. when x ＞ 0, f (x) = x (1-x), find the expression of F (x), and draw the image of F (x) in the given coordinate system
- 19. Given that the function f (x) is an odd function, when x belongs to (0,1), f (x) = LG (x 1), then when x belongs to (- 1,0), what is the expression of F (x)?
- 20. Given that the function y = f (x) is an odd function on R, and when x > 0, f (x) = 1, then the expression of the function y = f (x) is______ ．