1. If f (x) is known to be a decreasing function on R, then f (L1 / XL) is satisfied

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• 1. A function is an increasing function in one interval and a decreasing function in another interval, and a constant value is obtained
• 2. How to find the monotone decreasing interval of function y = | x + 3 |? RT. better be more detailed
• 3. If 1 ＜ x ＜ 2, simplify L1 XL + lx-2l
• 4. The range of X + 2 under y = LX + 1L + radical
• 5. Y = lx-1l + lx-3l (Note: sign of two absolute values) find the range = 2X-4, x > 3 (this equation is miscellaneous?) = 4-2x, x < 1 (same question!) = 2,1 I mean, we know that the range is 2, positive infinity. Ask the two formulas in the variational equation? 2X-4 and 4-2x
• 6. Find the 4-lx-3l domain of the function y = root Y = absolute value of 4 - (x-3) under root sign The absolute values of 4 - (x-3) are all under the root sign
• 7. If y = lx-3l + L5 + XL, then the minimum value of Y is
• 8. The range of function y = f (x) defined on R is [a, b], and the range of Zehnder function y = f (x-1) is [a, b]
• 9. The volume of the conical container is? 1? When the fan-shaped iron sheet with a central angle of 216 degrees and a radius of 5 is enclosed?
• 10. Replace X in (1 + 8%) x with specific value, and explain the meaning of the algebraic formula
• 11. Function y = cosx in interval__________ The interior is a decreasing function
• 12. Let the image of function f (x) = LX + 2L + LX al be symmetric with respect to the line x = 1, then the value of a is? Urgent method idea!
• 13. Given 2x-1 | 3-1 > x-5-3x | 2, find the maximum and minimum of | x + 1 | - | x + 3 |
• 14. Given 2x − 13 − 1 ≥ x − 5 − 3x2, find the maximum and minimum of | X-1 | - | x + 3 |
• 15. Set a = {XLX ^ 4-1 = 0, X ∈ C}, z = 2-3i, then the maximum value of LX ZL is?, and the minimum value is?
• 16. Let f (x) = lx-1l + LX Al, if any x ∈ R, f (x) ≥ 2, find the value range of A
• 17. What is the distance between the center of circle x + y = 25 and the realized x + y + 1 = 0?
• 18. The distance from the center of the circle x square + y square = 25 to the straight line x + y = 0 is—— Write down the specific process
• 19. The distance between a circle whose square of circle x + y equals 25 and a line whose square of circle x + y + 1 equals 0 is?
• 20. The distance between the center of a circle with x square plus y square equal to 25 and the line with x plus y plus 1 equal to 0 is