"Application of linear inequalities of one variable" PPT

Description

"Application of linear inequalities of one variable" PPT

Part One Content: Learning Objectives:

1. Able to list linear inequalities of one variable based on the quantitative relationship of specific problems to solve simple practical problems.

2. Be able to determine the practical significance of specific issues and test the rationality of the results sought.

Key points and difficulties in learning: the process of establishing unequal relationships.

Explore together

Students in Class 1 of Grade 7 donated 500 yuan to children in mountainous areas and planned to buy 12 sets of books A and B for them. It is known that books A are 45 yuan per set and books B are 40 yuan per set. The money How many sets of Category A books can I buy at most?

1. Suppose you can purchase x sets of Category A books. Fill in the blanks as required:

2. What is the relationship between the total amount of money spent on purchasing books A and B and 500 yuan? Can you express this relationship using an inequality?

45x+40(12-x)≤500

3. Solve this inequality and determine the answer to the actual problem based on the solution set.

(x≤4)

PPT on the application of linear inequalities of one variable, part 2: new lesson learning

Store A: After purchasing a total of 100 yuan worth of goods in this supermarket, any additional purchases will be charged at 90% of the original price.

Store B: After purchasing a total of 50 yuan worth of goods in this supermarket, any additional purchases will be charged at 95% of the original price.

analyze:

The starting point of store A’s discount plan is after the purchase amount reaches 100 yuan;

The starting point for store B’s discount plan is after the purchase amount reaches 50 yuan.

The shopping requirement is __________.

There are __________ to choose from.

When the shopping payments are 40 yuan, 80 yuan, 140 yuan and 160 yuan respectively, you have to pay __ yuan in store A and __ yuan in store B. How should you choose?

When the shopping payment is x yuan

The expression for payment at store A is 100+0.9(x-100),

The expression for payment at store B is 50+0.95(x-50).

PPT on the application of linear inequalities of one variable, part three: classroom activities

Activity 1

question

If my computer at home needs to access the Internet, there are two charging methods:

Type 1: 2 yuan/hour

Second type: no more than 30 hours, 1.5 yuan/hour; more than 30 hours, 2.5 yuan/hour

If I use the Internet 70 hours a month, which charging method should I choose?

If I use the Internet 60 hours a month, which charging method should I choose?

If I use the Internet for 50 hours a month, which charging method should I choose?

Activity 2

There are two charging methods for personal Internet access:

Type 1: 2 yuan/hour

Second type: no more than 30 hours, 1.5 yuan/hour; more than 30 hours, 2.5 yuan/hour

Activity 3

There are two charging methods for personal Internet access:

Type 1: 2 yuan/hour

Second type: no more than 30 hours, 1.5 yuan/hour; more than 30 hours, 2.5 yuan/hour

If you use the Internet for less than 60 hours per month, choose the second charging method.

If you use the Internet for 60 hours per month, you can choose between two charging methods.

If you use the Internet for more than 60 hours per month, choose the first charging method.

Keywords: Free download of Hebei Education Edition mathematics PPT courseware for seventh grade volume 2, application of linear inequalities of one variable PPT download, .PPT format;

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"Application of linear inequalities of one variable" PPT courseware:

"Application of linear inequalities of one variable" PPT courseware Part 1: Review of related knowledge 1. The concept of linear inequalities of one variable. 2. Solutions and precautions for linear inequalities of one variable. 3. What are the general steps for solving practical problems using linear equations of one variable? ...

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Update Time: 2024-10-17

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

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