"Solving Slightly Complex Encounter Problems by Using Equations" Equations PPT Courseware Simple campus recruitment activity planning plan summary enterprise and institution recruitment publicity lecture PPT template is a general PPT template for business post competition provided by the manuscript PPT, simple campus recruitment activity planning plan summary enterprise and institution recruitment promotion Lecture PPT template, you can edit and modify the text and pictures in the source file by downloading the source file. If you want more exquisite business PPT templates, you can come to grid resource. Doug resource PPT, massive PPT template slide material download, we only make high-quality PPT templates!
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Authoritative PPT Summary
"Solving Slightly Complex Encounter Problems by Using Equations" Equations PPT Courseware
teaching objectives
1. Combined with specific examples, experience the process of independently trying to find equivalence relationships and making equations to solve slightly complex encounter problems.
2. Be able to find equivalence relationships in encounter problems, be able to list equations and solve them, and be able to express the process of thinking about problems in an organized manner.
3. Be able to explore effective ways to use equations to solve encounter problems, understand the diversity of problem-solving methods, and gain successful experience in solving problems independently.
Review old knowledge
Xiaodong and Xiaoying walked toward each other from a distance of 360 meters at the same time. Xiaodong walks 50 meters per minute, and Xiaoying walks 40 meters per minute. How many minutes did it take for the two to meet?
360÷（50＋40）
=360÷90
=4 (minutes)
Answer: They met after 4 minutes.
Explore new knowledge
Two trains A and B departed from Beijing and Shanghai at the same time, traveling in each other's direction, and met each other after 7 hours. How many kilometers does a car travel per hour on average?
Talk about what mathematical information you learned and what problems you want to solve.
The distance traveled by car A in 7 hours + the distance traveled by car B in 7 hours = 1463 kilometers
The distance traveled by car A in 7 hours = total distance ÷ the distance traveled by car B in 7 hours
(Speed of car A + speed of car B) × 7 = total distance
Vehicle A’s speed + Vehicle B’s speed = total distance ÷7
give it a try
1. Each bag of rice weighs 50 kilograms and each bag of flour weighs 25 kilograms. This car is loaded with 48 bags of rice. How many bags of flour can it hold?
Solution: Suppose it can also hold x bags of flour.
3 tons = 3000 kilograms
50×48＋25x＝3000
2400＋25x=3000
25x=3000-2400
25x＝600
x=24
Answer: It can also hold 24 bags of flour.
2. Zhang Village and Licun built a road together. They started construction from one end of the village at the same time and completed it in 16 days. When completed, Zhang Village had built 80 meters more than Li Village. On average, Zhangcun repairs 75 meters per day. How many meters does Licun repair per day?
Solution: Let Licun repair x meters on average every day.
75×16－16x＝80
1200－16x=80
16x=1200-80
16x=1120
x=70
Answer: Licun builds an average of 70 meters a day.
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