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Authoritative PPT Summary
"Sum and Difference of Line Segments" PPT courseware 2
learning target
Knowledge and skills:
1. Understand the sum and difference of two line segments, and make the sum and difference of two line segments;
2. Understand the meaning of the midpoint of a line segment, and be able to use quantitative relationships to express the midpoint and perform corresponding calculations.
Process and methods: Experience the process of hands-on operations and independent exploration, once again appreciate the thinking method of combining numbers and shapes, develop the ability of "reasoning and deductive reasoning", and accumulate experience in mathematical activities.
Emotional attitudes and values: Actively participate in hands-on mathematical activities, enhance the awareness that learning mathematics is focused on application, stimulate interest in learning, and develop a spirit of exploration.
【Tracing Exercise】Answer
AC=CB= 3 (cm)
AB= AC + BC ,
AC=___AB，
BC=___AB.
【Test Case】Answer
1. =, =, 2AB, 2BC, 4, 8
2, 4, 2
3.C
As long as we observe carefully and think carefully, we can discover the wonders of mathematics in life. As long as you are a thoughtful person, you will definitely find that there is a lot of knowledge around us and in front of us waiting for us to explore and discover... …
Let us explore and fly freely in the wonderful world of mathematics, and enjoy the fun that mathematics brings us!
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"Sum and Difference of Line Segments" PPT courseware:
"Sum and Difference of Line Segments" PPT Courseware Example 1 Draw a line segment equal to a known line segment Solution: Given line segment a, draw line segment AB so that AB=a. Drawing method: (1) Draw ray AC; (2) On ray AC Intercept AB=a. So AB=a. Note: It is not required to write the drawing method, but it must be...
"Sum and Difference of Line Segments" PPT courseware:
"Sum and Difference of Line Segments" PPT Courseware Example 1 Draw a line segment equal to a known line segment Solution: Given line segment a, draw line segment AB so that AB=a. Drawing method: (1) Draw ray AC; (2) On ray AC Intercept AB=a. So AB=a. Note: It is not required to write the drawing method, but it must be...