Why? Who is the killer? Why? Page 4

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1. logical reasoning 1. If Zhang Sheng likes photography, he will like traveling. If he doesn't like photography, he will like driving. However, if Zhang Sheng doesn't like traveling, he won't be interested in driving. Therefore, Zhang Sheng () A like traveling B like driving C don't like driving d like photography 2 'the unit price of a store's goods is 75 yuan. It can sell 500 pieces. If the unit price is 1 yuan, it will sell 20 pieces less. In order to make the sales bigger, the unit price can be set as () A 50 yuan B 28 yuan C 27 yuan d 20 yuan 3. Xinjiang: Jiangsu: Suzhou () A Beijing: Nanjing: Yangtze River B Aerospace: Spacecraft: Astronauts C Yunnan: Anhui: Hefei D Shandong: Liaoning: Qingdao That's the second question, so I can't understand it
2. Logical reasoning for help, thank you one At the beginning of the year, in order to motivate employees to work hard, a company decided to select the "star of the month" according to their monthly performance. In the first 10 months of the year, Wang was elected as the "star of the month" only in four consecutive months. His other three colleagues, Zheng, Wu and Zhou, also did this (1) Wang and Zheng were elected at the same time for only three months; (2) Zheng and Wu were elected at the same time for only three months; (3) Wang and Zhou were not elected in the same month; (4) Only two were elected at the same time in July; (5) At least one was elected in January According to the above information, what is the month in which Wang was elected as the "star of the month" A. January to April B. March to June C. April to July D. May to August
3. What is logical reasoning
4. The annual electricity price of an area is 0.8 yuan and the annual electricity consumption is 100 million kwh. The annual plan is to adjust the electricity price to 0.55-0.75 yuan. According to calculation, if the electricity price is adjusted to X Yuan, the new electricity consumption of this year is y billion kWh and (x-0.4) yuan in inverse proportion, and when x = 0.65, y = 0.8 billion kwh (1) Write the relation between Y and X (2) If the electricity price is not higher than 0.5 yuan, at least how many kilowatt hours of new electricity will be added?
5. As shown in the figure, ab = AC, ∠ BAC = 120 ° in △ ABC, the vertical bisector EF of AC intersects AC at point E and BC at point F. verification: BF = 2cf
6. A math problem in grade two of junior high school In the plane rectangular coordinate system, the point whose abscissa and ordinate are integers is called integral point. The unit length of the coordinate axis is 1. The integral point P starts from the origin o, and its velocity is 1 unit length / s, and it only moves to the right or upward. Two integral points (0,1), (1,0) can be reached in one second, three integral points (0,2), (1,1), (2,0) can be reached in two seconds, and (0,3), (1,2), (2,2) can be reached in three seconds, 1) (3,0) four integral points (1) When p starts from O for 4 seconds, which punctuality can p reach? (2) How many seconds did P move when it reached (65,3)? (3) Write all the punctual points you can reach in 8 seconds
7. Xiaoming said to Xiaohua, "my age plus your age, and when I was your age, my age was 48." how old is Xiaohua now?
8. Solving equation (x ^ 2 + 1) ^ 2-x ^ 2 = 3
9. How many pairs of integers x and y satisfy the equation y ^ 4 + 2x ^ 4 + 1 = 4x ^ 2 * y?
10. If X. (power 0 of x) is the root of the quadratic equation AX & sup2; + BX + C = 0 (a ≠ 0), a = B & sup2; - 4ac, B = (2aX. + b) & sup2;. Try to compare the size of a and B
11. The following propositions: 1) the vertex angles are equal; 2) the two base angles of isosceles triangle are equal; 3) the two straight lines are parallel and the apposition angles are equal Among them, the converse proposition is the true proposition_______ Why not?
12. The following operation is incorrect () A. x2•x3=x5B. （x2）3=x6C. x3+x3=2x6D. （-2x）3=-8x3
13. It is known that (2, - 1) is a solution of the equation kx-y = 0, then the quadrant that the image of a straight line y = KX + 1 does not pass through is A: First quadrant B: second quadrant C: third quadrant D: fourth quadrant Given that Y1 = - x + 2, y2 = x + 4, when x takes what value, Y1 > Y2?
14. In the plane rectangular coordinate system, O is the coordinate origin, a (1,1), a point P is determined on the x-axis, so that △ AOP is an isosceles triangle, then the point P that meets the condition has () A. 4 B. 3 C. 2 d. 1
15. The questions are as follows: It is known that BC = 3, AC = 4, BC = 5 in} ABC. If} ABC is folded along the longest side AB so that} ABC 'and} ABC are in the same plane, then CC' is equal to A .12/5 B.5/12 C.5/6 D.24/5 BC = 3, AC = 4, ab = 5, sorry!
16. If Zhang Sheng likes photography, she will like traveling; if he doesn't like photography, he will like driving; but if Zhang Sheng doesn't like traveling, he won't be interested in driving According to this, it can be concluded that: A. Like traveling, B. like driving, C. don't like driving, D. like photography Please write the answer
17. Finding positive solutions to logical reasoning problems An adult asked his child to buy apples, gave him 3 yuan and asked him to buy 4 apples, but each apple was 2.5 yuan, but the child still had 40 cents left after he bought the apples. Q: How did he buy them?
18. Please help to solve a logical reasoning problem According to the statistics of the health and Quarantine Department of S City, compared with last year, the number of enteritis patients in this city has decreased significantly. Authorities believe that this is because the city's drinking water purification project has officially put into use Which of the following can't weaken the above authority's conclusion A. Compared with natural drinking water, the purified drinking water in s city lacks several important trace elements B. The drinking water purification project in s city started five years ago and was officially put into use the year before last C. Last year, s city carried out strict sanitation inspection and rectification on catering industry, especially on the stalls with poor sanitation conditions D. Due to the introduction of new diagnostic techniques, many cases previously diagnosed with enteritis were diagnosed with intestinal ulcer this year
19. Logical reasoning problem Only one of a, B, C and D got excellent in a certain technical examination. Only one of the following four judgments about their examination results is true. Ask: who is the outstanding one? Which judgment is true? Write down the reasoning process 1) If a does well, then B does well The one with excellent results is C A is the best, not b 4. The one with excellent results is a or D
20. Logical reasoning problem, The four people's cars are white, silver, blue and red. When they were asked about the colors of their cars, a said: B's car is not white. B said: C's car is red. C said: D's car is not blue. D said: there is one person in a, B, C's car is red, and only this person is telling the truth. If Ding is telling the truth, what colors are a, B, C and D's cars?