"Can I catch up with Xiao Ming" PPT courseware 2 on linear equations of one variable

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"Can I catch up with Xiao Ming" PPT courseware 2 on linear equations of one variable

Do it

1. If Xiao Ming runs 4 meters per second, then he can run _____ meters in 5 seconds.

2. Xiao Ming ran two laps around the school playground in 4 minutes (each lap was 400 meters), then his speed was _____ meters/minute.

3. It is known that Xiao Ming’s home is 1500 meters away from the train station. It takes him _____ minutes to reach the station by bicycle at a speed of 4 meters/second.

Basic knowledge of catching up:

What is the relationship between speed, distance and time?

Speed ​​= distance ÷ time

distance = speed × time

Time = distance ÷ speed

Example: Xiao Ming has to go to school 1,000 meters away from home before 7:50 every morning. One day, Xiao Ming set off at a speed of 80 meters/minute. Five minutes later, Xiao Ming’s father discovered that he had forgotten to bring his Chinese language documents. So, Dad immediately chased Xiao Ming at a speed of 180 meters/minute and caught up with him on the way.

(1) How long did it take for dad to catch up with Xiao Ming?

(2) When you catch up with Xiao Ming, how far is it from the school?

Analysis: Suppose it took x minutes for Dad to catch up with Xiao Ming, thinking about the characteristics of the two people’s movements and the relationship between the known quantities and the unknown quantities.

Give it a try:

The distance between stations A and B is 450 kilometers. A local train leaves station A and travels 65 kilometers per hour. An express train leaves station B and travels 85 kilometers per hour.

Find (1) How many hours will it take for two cars to meet each other when they drive out at the same time and go towards each other?

(2) The express train drives first for 30 minutes, and the two cars are traveling in the opposite direction. How many hours does the slow train travel before the two cars meet?

Please tell me about your learning experience in this class.

(1) To solve word problems (especially motion problems), you must learn to analyze quantitative relationships with the help of line segment diagrams;

(2) Learn how to interpenetrate and transform text language, graphic language, and symbolic language into each other.

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"Can I catch up with Xiao Ming" PPT courseware for linear equations of one variable:

"Can I catch up with Xiao Ming?" PPT courseware on linear equations in one variable. Xiao Ming has to rush to the school 1,000 meters away from home before 7:50 every morning. Xiao Ming set off at a speed of 80 meters/minute. Five minutes later, Xiao Ming’s father discovered that he had forgotten to bring his Chinese books. So, Dad immediately used 180 meters...

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Update Time: 2024-11-23

This template belongs to Mathematics courseware Beijing Normal University seventh grade first volume mathematics industry PPT template

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