"Constants and Variables" PPT

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"Constants and Variables" PPT

Part One: Learning Objectives

1. Through examples, let students understand the meaning of constants and variables and be able to cite constants and variables in reality.

2. Develop students’ abstract thinking and symbolic sense by exploring the relationship and change patterns between two quantities.

Focus: Understand the concepts of variables and openness and the relationship between them.

Difficulty: List the relationship expressions based on the relationship between constants and variables.

Constants and variables PPT, part 2: exploration of new knowledge

1. Independent learning

1. Self-study textbook, pages 60 to 61.

2. Preliminary understanding of constants and variables

2. Explore together

1. According to scientific research, the daily sleep time (H hours) required by a person aged 10 to 50 can be calculated by the formula H = (110-N)/10, where N represents the age of the person. Please do the math quickly. Get the sleep you need!

The quantities that don't change are: 110 and 10.

The quantities that will change are: H and N.

2. The formula for the area of ​​a circle is S=πr2

Please take some different values ​​of r and calculate the corresponding value of S:

The quantity that does not change is: π

The quantities that will change are: S and r

3. Assume that the working standard of hourly workers is 6 yuan/hour, the number of working hours is t, and the amount of wages due is m, then m=6t. Take some different values ​​of t and find the corresponding value of m

The amount that will not change is: 6 yuan/hour

The quantity that will change is: m,t

Constants and variables PPT, part 3: concepts

What is a constant?

In a process, a fixed quantity is called a constant.

What is a variable?

In a process, quantities that can take on different values ​​are called variables.

For example: 110 and 10 just now, π is a constant

H and N, s and r are variables

Constants and variables PPT, Part 4: Classroom exercises

Indicate the constants and variables in the following events

⒈The unit price of oranges in a fruit store is 2.5 yuan/kg, and the total price of buying K thousand oranges is S yuan, where the constant is ____________ and the variable is ____________

2. The relationship between the circumference C of the circle and the radius r of the circle is C = 2πr, where the constant is ____________ and the variable is ____________.

3. The relationship between the speed v (m/s) of sound propagating in the air and the temperature t (. C) is v = 331 + 0.6t, where the constant is ____________ and the variable is ____________.

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"Constants and Variables" PPT courseware:

"Constants and Variables" PPT courseware Part One: New Lesson Introduction On October 15, 2003, my country's Shenzhou 5 manned spacecraft was successfully launched. After orbiting the earth 14 times, the spacecraft's return capsule successfully returned to the ground at 6:23 on October 16. Below is the return of the Shenzhou 5 spacecraft...

"Constants and Variables" PPT courseware:

"Constants and Variables" PPT courseware Part One: New Lesson Introduction On October 15, 2003, my country's Shenzhou 5 manned spacecraft was successfully launched. After orbiting the earth 14 times, the spacecraft's return capsule successfully returned to the ground at 6:23 on October 16. Below is the return of the Shenzhou 5 spacecraft...

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Update Time: 2024-10-05

This template belongs to Mathematics courseware Hebei Education Edition Eighth Grade Mathematics Volume 2 industry PPT template

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