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Authoritative PPT Summary
"The Meaning of Proportionality" PPT
Part One: Teaching Objectives
1. Understand the meaning of direct proportion and be able to judge whether two quantities are directly proportional based on the meaning of direct proportion.
2. Initially train students to analyze problems from the perspective of interconnectedness and development of things.
3． Preliminary penetration function ideas.
observe
1. What two quantities are in the table?
2. How do scores change with reps?
3． What are the corresponding ratios of scores and times? What is the ratio?
The meaning of proportionality PPT, part 2: take a look
Looking at these two tables, what do they have in common?
1. The situation of the rock, paper, scissors game.
2. The time and distance traveled by a train are as follows.
(1) There are two associated quantities
(2) The ratio (that is, the quotient) of the two corresponding numbers is certain
The meaning of proportionality PPT, the third part: do it
Decide whether the two quantities in each question below are directly proportional and explain why.
1. The number of books in each package is the same, the number of packages and the total number of volumes.
2. The number of students in the class is certain, as well as the number of students in each group and the number of groups.
3. The floor area of the room is certain, the number of people in the room and the area occupied by each person.
4. The sum is certain, the addend and another addend.
5.A person's age and his weight.
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