Guangdong Civil Servants' Math Operation Exercise * * * A * * *
There are 48 birds in three trees in the forest. If eight birds fly from the first tree and land on the second tree, and then six birds fly from the second tree and land on the third tree, then the number of birds on the three trees is equal. How many birds landed on the second tree? *** ***
14， 15， 16， 18
On March 5th, the school organized 85 students to participate in learning from Lei Feng. Some students went to nursing homes, while others went to orphanages. At the time of departure, it was temporarily decided to transfer 2 1 students who went to nursing homes to orphanages. As a result, 27 more students went to orphanages than to nursing homes. How many people went to the nursing home at first? *** ***
A.50 B.47 C.35 D.29
Examples are red, yellow and blue flowers, 60 red flowers and yellow flowers together, 70 yellow flowers and blue flowers together and 80 red flowers and blue flowers together. So how many yellow flowers are there? *** ***
A. 15
For example, in the math contest, there are two ways to give points: one is to give 5 points for a correct answer, 2 points for a wrong answer, and no points for a wrong answer; The other is to give 40 points first, give 3 points for answering a question correctly, give no points for not answering, and deduct 1 point for answering incorrectly. A candidate got 8 1 for both methods. How many questions are there in this competition? *** ***
22 C.25 D.28
Example: Students from Class A and Class B visit the airport 24 kilometers away from the school. But students who can only take one class at a time have only one car. In order to get to the airport as soon as possible, the two classes agreed that Class A should take the bus first, Class B should walk first and set off at the same time. Class A students should get off at some time on the way, then walk to the airport, and the bus will immediately return to Class B students who are walking on the road. If the walking speed of the two classes is the same and the speed of the bus is seven times that of them, then the bus will return to the place a few kilometers away from the airport to meet the students of Class B. *** ***
A. 1.5 B.2.4 C.3.6 D.4.8
Answers to mathematical operation questions of Guangdong civil servants' line test
Analysis A. Now there are 48÷3= 16 birds on each tree, so there are 16-8+6= 14 birds on the second tree.
Analysis A. Now there are ***85-27***÷2=29 people going to nursing homes, so the original number of people going to nursing homes is 29+2 1=50.
Analysis B. There are ***60+70-80***÷2=25 yellow flowers.
Analysis B. If the answer to question A is correct, the answer to question B is wrong, and the answer to question C is wrong, the equations 5a+2b=8 1①, 40+3a-c=8 1② can be listed. From ①, A is odd, a≤ 16, from ②, a≥ 14, so A.
Analysis D. Assume that the walking speed of students is X km/h, the driving speed of cars is 7km/h, and the demand is y=4.8. The driving time of cars is the same as that of students. The equation can be listed as =+,and the solution is Y = 4.8km * * * 2 * * for Guangdong civil servants.
For example, a cuboid with a length of 10 decimeter, a width of 8 decimeters and a height of 6 decimeters is drawn in green, and Li Shifu divides it into cubes with a side length of 1 decimeter. Then color all the parts that are not green. How big is the area to be painted?
2880 square decimeter 2504 square decimeter 2424 square decimeter 376 square decimeter
There is a project in which three engineering teams, A, B and C, take turns to do it every day. The original plan was to do it in the order of A, B and C, which happened to be completed in an integer number of days. If we do it in the order of B, C and A, it will take 1/2 days longer than originally planned; If we do it in the order of C, A and B, it will take 1/2 days longer than originally planned. It is known that it takes 10 days for Party A to complete the project alone, and the work efficiency of the three engineering teams is different. How many days will it take for Party A, Party B and Party C to complete this project?
Example: In 2006, someone worked for 24 consecutive days, with a daily wage of 190 yuan * * daily wage of 10 yuan, a half-day salary of 5 yuan on Saturday and no salary on Sunday. It is known that his work started on a certain day in late June, 1, and this month's June, 1, happened to be Sunday, and the day this person finished his work was February * * * *.
A. February 6th B. February14 c. February18 d. February 2nd1
The example starts at 5 o'clock sharp. When the second hand makes an angle of 90 degrees with the minute hand for the first time, the angle between the second hand and the hour hand is * * * * *.
On Sunday, Cong Cong and his mother went to the bookstore to buy books. Cong Cong used half of his savings to buy a math book. Later, his mother gave him 5 yuan, and he used more than half of 0.4 yuan to buy a foreign language book. As a result, 7.2 yuan was left. How much money did he have before he bought a math book? *** ***
28.6 C..24.2 D
Answers to mathematical operation questions of Guangdong civil servants' line test
Analysis B. The surface area of the original cube is10× 8× 2+10× 6× 2+8× 6× 2 = 376 square decimeter, and the area of all the lower cubes after segmentation is/kloc-0 /×/kloc-0 /××××/kloc.
Analysis D. Do it in the order of A, B and C. The second and third conditions are only established when it is A's turn to finish. In the first case, the order is a, b, c, a, c, a, b, c, a, B 1/2 C, and in the third case, c, b, c, C 1/2 A ... so a = c+/kloc.
Analysis D. Every 7 days, the salary is 5× 10+5=55 yuan, and one * * has 24÷7=3 weeks ... 3 days, and the salary for 3 weeks is 3×55= 165 yuan, so I earned190-/kloc for the remaining 3 days. Since he started on a day in late October of 65438+ 10, this day should be 65438+1October 26th, so he ended on February of 18.
Analysis C. The second hand moves 360÷60=6 degrees per second, and the minute hand moves 360÷3600=0. 1 degree per second, so it is 90 ÷ * * 6-0.1* = seconds from 5 o'clock sharp, and the second hand and the minute hand are connected for the first time. The angle between the second hand and the hour hand is
Analysis D. It turned out to be [***7.2+0.4***×2-5]×2=20.4 yuan.