First, multiple choice questions
The reciprocal of 1 -5 is ()
A.- 5 years BC-5 years BC
2. The following operation is correct ()
A.3x-2x=x B.-2x-2=- C. D。
3. The National Stadium "Bird's Nest" project covers a total area of 2 1 hectare with a construction area of 258,000. The opening and closing ceremonies, track and field competitions and football finals of the Olympic and Paralympic Games will be held. After the Olympic Games, it will become a landmark sports building and Olympic heritage in Beijing. Among them, 258,000 universal scientific counting method is expressed as ().
a . 258 x b . 25.8 x c . 2.58 x d . 0.258 x
4. The solution of the unary quadratic equation is ()
A.B. C. D。
5. The radii of the two circles are 2 and 3 respectively, and the center distance is 5, so the positional relationship between the two circles is ().
A. Externalization B. Insectization C. Intersection D. Externalization
Second, fill in the blanks
.
6. A set of data is known: -3, -3, 4, -3, x, 2; If the average value of this set of data is 1, then the median value of this set of data is.
.
Third, answer questions.
7. Calculation:-22+(tan 60o-1) ×+(-)-2+(-π) o-| 2-|
8.5? 12 after the Wenchuan earthquake, the people of the whole country were United as one. The chief visited the tent factory and arranged the production task of disaster relief. The following is the dialogue between the section chief and the factory director:
Chief: In order to support the people in the disaster area, the organization requires you to complete the production task of 12000 tents.
Director: In order to support the people in the disaster area as soon as possible, we plan to increase the daily output by half.
Director: How many days can we finish the task ahead of schedule?
Director: Please rest assured! Guarantee to finish the task 4 days ahead of schedule!
According to the dialogue, how many tents does this factory produce every day?
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Iv. Answering questions (3 small questions in this big question, each small question 12 points, ***36 points)
22. Party A and Party B play the game of "hammer, stone, scissors and cloth". They put 15 cards with the same shape and size in opaque bags, and the number of cards with the words "hammer", "stone", "scissors" and "cloth" is 2, 3, 4 and 6 respectively.
(1) If A touches it first, what is the probability that he touches the "stone"?
(2) If A touches the "stone" first, what is the probability that B will win?
(3) If A touches first, which card is most likely to win?