![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
The explanation of intersecting line and parallel line How to answer? From which aspects
Two lines that never intersect are called parallel lines. They can be set up in a plane or in space
Intersecting line; two nonparallel lines in the same plane,
1. Xiao Li and Xiao Ming practice typing. Xiao Li typing 35 words per minute more than Xiao Ming. Xiao Li typing 400 words at the same time as Xiao Ming typing 300 words. How many words can Xiao Li and Xiao Ming type each minute?
2. Given 1 / X - 1 / y = 3, find the value of fraction 2x + 3xy - 2Y / X - 2XY - Y
1. Let Xiao Ming play x per minute, and Xiao Li play (x + 35)
400 / (x + 35) = 300 / X followed by a fractional equation
The result is x = 105, so Xiaoli has 140 per minute and Xiaoming has 105
2. The left and right sides of the first formula multiply XY to get Y-X = 3xy
Then X-Y = - 3xy, substituting into the second formula, we get - 3xy / - 5xy = 3 / 5
1. Why multiply an integer by 2 plus 7, multiply the result by 3 minus 21, and the result must be a multiple of 6?
2. Given that the absolute value of the square of (3x-2) plus 2x-y-3 is equal to 0, find the value of 5 (2x-y) - 2 (7x-2y + 2) + (9x-3y-1 / 2)
1. Because after such calculation, you are equal to multiplying this integer by 6. Of course, it can be divided by 6. 3 (2n + 7) - 21 = 6N + 21-21 = 6N
2. 3x-2=0, 2x-y-3=0. x=2/3. y =-5/3
5（2x-y）-2（7x-2y+2)+(9x-3y-1/2)
=15-20+(6+5-1/2)
=5+1/2
=11/2
RELATED INFORMATIONS
- 1. A family of three travel to the North during the holiday. There are two local travel agencies, a and B, whose prices are the same, but there are concessions for family travel. A travel agency says that adults don't discount, while children get 60% off. B travel agency says that all three people get 20% off. After accounting, B travel agency wants 240 yuan cheaper. How much is the adult's price?
- 2. Make a straight line through a vertex of a polygon. After cutting off two corners of the polygon, the sum of its internal angles is 1260 degrees. What is the number of original sides of the polygon?
- 3. As shown in the figure, P is the point on the fixed length line AB, and C and D respectively start from P and B and move to the left along the line AB at the speed of 1cm / s and 2cm / S (C is on the line AP and D is on the line BP) (1) If there is always PD = 2Ac when C and d move to any time, please indicate the position of P on line ab (2) Under the condition of (1), q is a point on the line AB, and aq-bq = PQ (3) Under the condition of (1), if C and d move for 5 seconds, then C stops and D continues to move (D is on line Pb), m and N are the midpoint of CD and PD respectively. The following conclusions are drawn: ① the value of PM + PN remains unchanged; ② the value of PM + PN remains unchanged. Only one of the two conclusions is correct. Please find out the correct conclusion and evaluate it
- 4. Three seventh grade math problems. Anxious~ 1. There are several numbers, denoted as the first power of a, the square of a, the cube of a,..., the nth power of A. It is stipulated that the square of a = the first power of 1 / 1-A, the cube of a = the square of 1 / 1-A, the fourth power of a = the third power of 1 / 1-A.. The nth power of a = the nth power of 1 / 1-A If the power 1 of a = - 1 / 2, what is the value of the power 1000 of a 2. From the third grade of primary school, a classmate has used the lucky money to subsidize hope primary school on the first day of school every year, and every year he always subsidizes m yuan more than the last one. If he subsidizes hope primary school for n yuan in the fifth grade, then he subsidizes hope primary school in the seventh grade this year________ (n > 2m) 3. If a round paperboard is cut into several sectors according to the requirements, the operation is as follows: for the first cutting, the round paperboard is equally divided into four sectors, for the second cutting, one of the four sectors obtained last time is equally divided into four sectors, and then the second cutting is carried out (1) Please write down the total number of sectors of the 1st, 2nd, 3rd, 4th and Nth power (2) According to the above rules, how many sector paperboards can be cut from the original round paperboard after the 2008 operation?
- 5. Hurry! Ten minutes to! Very simple elementary school mathematics sixth grade score application problem! Xiaoyue walked from the East Village to the West Village. After walking 3 / 8 of the whole venue, she walked 60 meters, 20 meters more than the key point. How many meters is the distance between the East and west villages?
- 6. Hurry! Ten minutes to! Primary school mathematics sixth grade score reduction method to solve application problems! The main road team built a road. On the first day, it built 1 / 5 and 100 meters of the total length. On the second day, it built the remaining 2 / 7 and 500 meters. How many meters is the total length of the road? (use equation solution) Write down the process again, please!
- 7. The width of a cuboid is half of its length, and its length is four times of its height. The total length of its sides is 56cm. How many square cm is its volume?
- 8. If you can use the solution of the equation, write the solution. If you can't use the solution of the equation, use the arithmetic method 1. The clothing factory used to make 2.5 meters of cloth for a suit of clothes. After improvement, 0.5 meters can be saved for each suit. How many sets of cloth can be made for 60 sets of clothes? 2. The speed sum of car a and car B is 110 km / h. car a travels 10 km more per hour than car B
- 9. Fifth grade practical problems (solving equations) 1. A circular runway is 800 meters long. Party A and Party B set out from AB, 200 meters apart, in the same direction at the same time. When they set out, Party A was behind and Party B was ahead. 10 minutes later, Party A overtook Party B. It is known that Party B travels 50 meters per minute. Question: how many meters does party a travel per minute? 2. The distance between Party A and Party B is 120 km. The passenger cars and freight cars start from place a to place B at the same time. The passenger cars travel 20 km per hour, and the freight cars 60 km per hour. When the freight cars arrive at place B, they immediately go to place B. Q: how long does it take for the freight cars to meet the passenger cars after they arrive at place B? How far is it from place a at this time? 3. The distance between Party A and Party B is 280 kilometers, and the bus and truck start from place a to place B at the same time. The bus travels 35 kilometers per hour, which is half the speed of the truck. When the truck arrives at place B, it immediately drives to place a, and then it meets the bus two hours later 4. Mr. Zhang and Mr. Wang started from school to the children's palace at the same time. Two minutes later, Mr. Zhang found that he didn't bring the certificate, so he ran back to school to get it. Mr. Wang continued to walk. Mr. Zhang's running speed was 100 meters, and Mr. Wang's walking speed was 50 meters per minute? 5. Dad and mom set out from home for dinner at the same time. Six minutes later, they found that they didn't have any money with them. So Dad rode back to get the money, while mom continued to walk to the hotel. After six minutes, they arrived at the hotel at the same time. It was known that mom walked 50 meters per minute and dad rode 150 meters per minute. How far was it from home to the hotel? 6. A circular runway is 600 meters long. Party A and Party B start from the starting point at the same time and go in opposite directions. Two minutes later, Party A turns to chase Party B. It is known that Party A does not go 60 meters per minute, while Party B goes 40 meters per minute. Question: how long has it taken from the starting point to the meeting point, and how far is it from the starting point?
- 10. Solving practical problems with reduction method in primary school For a basket of apples, a takes out 1 / 3 of them and then takes out 1 / 3, B takes out the remaining 1 / 3 and then takes out 1 / 3, C and d take them according to the above method. At this time, there are still 15 apples in the basket. How many are there in the basket? Specific algorithm Speed~~~
- 11. In the first quarter of 2006, the output value of a hardware factory in a city was 150000, 200000 in the second quarter, 230000 in the third quarter, 280000 in the fourth quarter, 10 in the first quarter, 12 in the second quarter, 15 in the third quarter and 18 in the fourth quarter. According to the average quarterly growth rate in 2006, how many million annual output value in 2007?
- 12. 1: If the bus starts from a for 9 hours, the distance between the two vehicles is 3000 km. How many meters is the distance between a and B 2: Car a and car B leave from city a and city B at the same time, and they can meet each other in six hours. Now car a starts from city a, and it's 210 kilometers away from city B one hour later. Car B starts from city B, and it's 230 kilometers away from city a one hour later. How many kilometers are there between city a and city B 3: A batch of pesticides was transported to a village. 4 / 7 of the total amount was used in the first day, 12 kg more than twice the amount used in the second day. At this time, the ratio between the amount used and the rest is 27:8. How many kg does this batch of pesticides weigh 4: A truck team transported a batch of cement from the factory to the construction site. On the first day, it transported more than 1 / 4 7 tons of all cement, and on the second day, it transported the remaining 2 / 5 more than 2 tons. At this time, it transported 5 / 18 of all cement. How many tons of original cement 5: After 1 / 3 of the coal in pile a and pile B is transported to pile B, 40% of the coal is transported from pile B to pile A. at this time, there are 48 tons in pile a and 42 tons in pile B. how many tons of coal are there in pile a and pile B
- 13. Set up equations to solve practical problems== The ratio of output per unit area of a and B crops is 1:1.5. Now we need to divide a 200 meter long and 100 meter wide rectangular land into two small rectangles. How to divide the two crops into two parts, so that the ratio of total output value of a and B crops is 3:4 (the result is taken as an integer) Tip: if the length is ab, take a little e, AE = XM, be = YM To calculate the process! ~ ~ will add points~~~~
- 14. The general steps of solving practical problems with equations Be brief (no more than 27 words)
- 15. There are several three legged stools and four legged chairs, and they are all manned. If there are 39 legs, how many people are there?
- 16. There are several stools and chairs in the room. Each stool has three legs and each chair has four legs. When they are all sat on, there are 43 legs, including two for each person Leg, how many people are there in the room
- 17. There are three legged chairs and four legged chairs in the classroom. It is known that there are 60 chair legs and 15 chairs, How many are the three legged chair and the four legged chair?
- 18. Use a 2-meter-long wood, saw into four pieces of the same length, used to make stool legs, the height of the stool is about______ Decimeter
- 19. A student desk consists of a desk top and four legs. If one cubic meter of wood can make 50 desks or 300 legs, there are 15 cubic meters of wood A student desk is composed of a desk top and four legs. If one cubic meter of wood can make 50 desks or 300 legs, and there are 15 cubic meters of wood, please design how much wood to use for the desk top and how much wood to use for the legs?
- 20. A student desk consists of one desk top and four legs. If one cubic meter can make 50 desks or 300 legs, there are 15 cubic meters of wood, Please design how much wood to use for the table top and how much wood to use for the table legs