Mathematics (science, engineering, agriculture and medicine)
1. Multiple-choice question: This question is entitled * * 10, with 5 points for each question and 50 points for * *. Of the four options given in each question, only one meets the requirements of the topic.
1. The minimum value of this function is
A.- BC 1
1. answer: B.
[analysis] ∫ ∴. So choose B.
2. If the complete set U=R is known, then the set is equal to.
A.∣0 x 2 ∣0<； x & lt2}
C.{ x ∣x<； 0 or x & gt2} D {x ∣x 0 or x 2}
2. A: A.
[analysis] ∫ calculation is available or ∴. So choose A.
3. If the sum of the first n terms of arithmetic progression =6 and =4, the tolerance d is equal to.
a . 1 B . c .-2D 3
3. Answer: C
[resolution] ∵ and. So choose C.
4. equal to
A.B. 2 C. -2 D. +2
4. Answer: D.
[resolution] ∫. So choose D.
5. In the following function, it satisfies "For any, (0,) when.
Yes
A.= B. = C . = D
5. A: A.
[Analysis] The function that can be obtained according to the meaning of the question should be monotonically decreasing, so you can get a correctly from the options.
6. Read the program block diagram shown on the right, run the corresponding program, and the output result is w.w.w.k.s.5.u.c.o.m
A.2 B .4 C. 8 D . 16
6. Answer: C
[Resolution] According to the algorithm program diagram, the "No" command is executed before n =4, so n=2×4=8. So I chose C.
7. Let m and n be two different straight lines on a plane and two intersecting straight lines on a plane, then a necessary and sufficient condition of//is w.w.w.k.s.5.u.c.o.m
//and l // B. m // l and n // l in the morning.
C.m // and n // D. m // and n // l
7. Answer: B
[Resolution] If available. If, it exists.
8. It is known that the probability that an athlete hits every shot is 40%. At present, the method of random simulation is used for motion estimation.
The probability of a player hitting twice with three shots: first, the calculator calculates an integer random number between 0 and 9,
Specify 1, 2, 3 and 4 as hits, and 5, 6, 7, 8, 9 and 0 as misses; Then every three random numbers are a group, representing the result of three shots. After random simulation, 20 groups of random numbers are generated:
907 966 19 1 925 27 1 932 8 12 458 569 683
43 1 257 393 027 556 488 730 1 13 537 989
Based on this, it is estimated that the probability of an athlete hitting twice with three shots is as follows
a . 0.35 B . 0.25 C . 0.20D . 0. 15
8. Answer: B
[Analysis] The probability of hitting each shot can be estimated from the random number, and the probability of hitting three shots twice is 0.25, so choose B.
9. Let A, B and C be nonzero vectors with any three starting points in the same plane, and satisfy that A and B are not * * *.
First ∣a∣=∣c∣, then ∣b? 6? The value of 1 c∣ must be equal to w.w.w.k.s.5.u.c.o.m
A. a triangular area with a and b as two sides and b and c as two sides.
C. the area d of a parallelogram with a and b as adjacent sides; The area d of a parallelogram with b and c as adjacent sides.
9. Answer: C
Choose c according to the meaning of the question.
10. The image of the function is symmetrical about a straight line. It can be inferred that the solution set of the equation about x cannot be any non-zero real number A, B, C, M, N, P.
A.B C D
10. answer: D.