(A) (B) (C) (D)
2. The following classification is wrong ()
A.B.
C.D.
3. If the maximum value of the function in the interval is a multiple of the minimum value, the value of is ().
A.B. C. D。
4. The image of the function is ()
5. The interval where the function zero is located is ()
A.B. C. D。
6. Let a function be defined on a real number set, and its image is symmetrical about a straight line, and if,, then there is ().
A.B.
C.D.
7. The image of the function is roughly ()
8. If the function f(x) defined on r satisfies f(x)=, the value of f(3) is ().
A.- 1 B. -2 C. 1 D. 2
9. The domain of this function is
10. The domain of this function is
1 1. The range of the function y = x2+x (- 1 ≤ x ≤ 3) is
12. Calculation: lg +(ln)
13. As we all know, if there are three zeros, the range is
14. If there are four zeros in the function, the range of real numbers is
15. It is known that the distance between A and B is 150km. Someone drives from A to B at a speed of 60km/h and stops at B 1 hour.
Then return to a place at a speed of 50 km/h, and express the distance x from a place as a function of time t (hours).
This expression is
16. The state stipulates that the tax payment method for individual manuscript fees is: no tax is paid if it does not exceed 800 yuan; If it exceeds 4,000 yuan in 800 yuan, it will be taxed according to the excess of 14%; Taxes exceeding 4,000 yuan shall be paid at 1 1% of the total salary. Someone paid 420 yuan for a book, and this person's remuneration was.
Yuan.
17. A classmate studied the function () and gave the following conclusions respectively:
(1) The equation holds in time; ② The range of the function is (-1,1);
(3) If there is, there must be; ④ There are three zeros on the function.
The serial number of the correct conclusion is.
18. known sets,
(1) Use the number axis to search separately;
(2) The set of values of known, assumed and realistic numbers.
19. Known functions
(1) Judge and prove the parity of the function in its domain (2) Judge and prove the monotonicity of the function in its domain.
(3) Solving inequalities
20. The known function is odd function, which monotonically decreases in the definition domain.
(1) If the size is compared;
(2) If the domain of is and the value range of is.
2 1. Know the function and judge the parity.
22. Meet the quadratic function, and.
Analytical formula of (1);
(2) In the interval, try to determine the range of real numbers, where the image is always above the image.
answer
1.D 2。 C 3。 A 4。 B 5。 B 6。 B
7. Function A is meaningful and needs to be defined as excluding C and D..
Similarly, because the time function is a decreasing function, a is chosen.
8.B 9。 ( , 1) 10. 1 1. 12., 13.
14. 15. 16.3800 17.①②③
18. Solution: (1),
Or, or or.
(2) As shown in the figure (axis number omitted), solve.
19. Solution: (1) Prove:, so the function is odd function.
(2) Proof of definition
(3)
20. Solution: (1), and monotonically decreasing in the definition domain, ⅷ
(2), odd function, and monotonically decreasing in the definition domain.
∴
2 1. solution: if, is an even function; When, the function is neither odd function nor even function.
22. Solution: (1), then
Compared with the known conditions, the solution is obtained. Again,
(2) that is to say, if it is true, it is absolutely correct! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !