=25.6
2. The volume of the cone is 25. 12 cubic decimeter, the radius of the bottom is x decimeter and the height is 6 decimeter.
= 25. 12
3. Li Juan bought two ballpoint pens and three exercise books, and * * * paid 7.2 yuan, each exercise book was X yuan and each exercise book was Y yuan.
=7.2
The fruit shop brought 420 kilograms of apples, each 25 kilograms was packed in a box, and after the X box was packed, there were 20 kilograms left.
=20
The washing machine factory produces 260 washing machines every day this year, which is 40 less than last year's average daily output and 2.5 times that of last year. How many washing machines did it produce every day last year?
Solution: Set.
6. A metal wire can be used to form a square with a side length of 4 cm, and this metal wire can be used to form a rectangle with a width of 2 cm. What is the length of this rectangle?
Solution: Set.
7. Two cargo ships set off from a dock at the same time, heading east and west respectively. Ship A travels 30 kilometers per hour and ship B travels 42 kilometers per hour. After several hours of sailing, the distance between the two ships is 252 kilometers.
Solution: Set.
8. The circumference of a rectangle is 1 12m, and its length is three times its width. What is the width of this rectangle?
Solution: Set.
Second, the column equation to solve application problems:
1. A cubic steel with a side length of 6 decimeters was cast into a conical mold with a bottom area of 48 square decimeters. What is the height of this mold?
2. A construction team built a section of highway, originally planned to repair 56 meters a day, and completed it in 15 days. In fact, I repaired 4 meters a day. How many days did it actually take?
3. Two workshops 150 people. If 50 people are transferred to the first workshop, the number of people in the first workshop is the second workshop. How many people are there in workshop 2?
The weight of apples in basket A is three times that of apples in basket B ... If 20kg is taken from the first basket and put into the second basket, the weights of the two baskets are equal. How many kilograms of apples are there in each basket?
5. The master and the apprentice * * * processed 208 parts, and the number of parts processed by the master was four times that of the apprentice. How many parts has the master processed?
6. There are two ticket systems for newly opened buses in Xinjiang, one is ordinary ticket, and the other is 5 yuan ticket. One day, when the conductor counted the ticket income, he found that there were 880 passengers that day, and the income from the pass ticket was more than that from the ordinary ticket 1740 yuan. How many people bought passes on this day?
7. Apples, pears and oranges 100 kg, in which the weight of apples is 3 times that of pears, and the weight of oranges is 8 kg lighter than pears. How many kilograms are there in oranges?
8. Master Zhang processed a batch of parts, and originally planned to make 50 pieces a day. In order to finish it 10 days in advance, he improved his efficiency and made 75 pieces a day. How many parts are there in this batch?
9. An airplane can use fuel for 6 hours. When the plane flies downwind, the speed can reach 1.500 km/h, and when it flies back, the speed can reach 1.200 km/h. How many kilometers can this plane fly at most?
* 10, Xiaohong and Xiao Qiang start from home at the same time. Xiaohong walks 52 meters per minute and Xiao Qiang walks 70 meters per minute. They meet on the way. If Xiaohong leaves four minutes early and the speed remains the same, and Xiao Qiang walks 90 meters every minute, then the two will still meet at point A. How many meters away is Xiaohong from Xiao Qiang's home?
Third, life problems: please choose the right way to solve them.
1, park ticket office regulations: individual tickets for 2 yuan, group tickets (maximum 10 people) 15 yuan. Two teachers took 36 students to the park to play. Please do the math and think about how to buy tickets with the least money. How much will it cost at least?
2. A city transportation management office announced the taxi charging standard. Taxi charging method: the starting price is 3km in 7 yuan, and the charging standard after 3km is per kilometer 1.20 yuan. One-way passenger transport (refers to a taxi that returns to A empty from B after passengers arrive from A to B) 10 km, no idling fee is charged, and 50% idling fee is charged for the part exceeding 10 km. Two-way passenger transport (that is, passengers arrive at the second place and return to the first place by the original bus) does not include air fares.
For example, passenger A travels one way by taxi15km. How much fare should he pay?
1.2× (10-3) = 8.4 yuan (15-10 )×1.2× (1+50%) = 9.
(1) Huang Zhang took a taxi for 5 kilometers. How much is the fare?
(2) When Shi Qian took a taxi home, she paid 13 yuan. How many kilometers did she walk by taxi?
(3) Taxi trip in Chen Ting18km. How much is the fare?
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