"Application of linear equations of one variable" PPT courseware 2

Description

"Application of linear equations of one variable" PPT courseware 2

Use your brain

If a store sells a certain model of color TV at 20% off the listed price, then the profit margin of each color TV at this time is 5%. It is known that the purchase price of this model of color TV is 4,000 yuan per unit, find the list price of this model of color TV.

The equivalent relationship involved in this problem is: selling price - purchase price = profit.

If the price of each color TV is set to x yuan, then the selling price and profit of the color TV can be expressed separately, as shown in the figure.

Solution: Suppose the price of color TV is x yuan per unit. According to the equivalent relationship, we get

0.8x -4000 = 4000×5%

Solve for x =5250.

Therefore, the price of the color TV is 5,250 yuan per unit.

Example

Example 2 On October 1, 2011, Yang Ming deposited a sum of money in a bank for 3 years with an annual interest rate of 5%. If he withdraws it after maturity, he can get the principal, interest and 23,000 yuan. Find the principal deposited by Yang Ming How much is it?

Analysis The money deposited by customers in the bank is called principal.

The remuneration paid by banks to customers is called interest.

Interest = principal × annual interest rate × number of years.

The equivalence relations involved in this problem are:

Principal + interest = sum of principal and interest.

practise

1. A city issues football lottery tickets and plans to use 49% of the total issued amount as bonuses. If the total bonus is 93,100 yuan and each lottery ticket is 2 yuan, how many lottery tickets should be sold to cash in the bonus?

Solution: Suppose x lottery tickets are issued. According to the meaning of the question, we get

2x49%x = 93100

Solving this equation, we get x = 95000

Answer: 95,000 lottery tickets should be sold to cash in the bonus.

2. On November 9, 2011, Li Hua deposited a one-year time deposit in a bank with an annual interest rate of 3.5%. When he withdraws it after one year, he can get the principal, interest and 3105 yuan. What is the amount of money Li Hua deposited? How much is the principal amount?

Solution Assume that the principal deposited by Li Hua is x yuan. According to the equivalent relationship, we get

x+1×3.5% x = 3105

Solve to get x=3000

Answer: The principal deposited by Li Hua is 3,000 yuan.

Keywords: Application teaching courseware of linear equations of one variable, Qingdao edition seventh grade mathematics volume PPT courseware download, seventh grade mathematics slide courseware download, Application of linear equations of one variable PPT courseware download, .PPT format;

For more information about the PPT courseware "Applications of Linear Equations of One Variable", please click on the "Applications of Linear Equations of One Variable" ppt tab.

"Application of linear equations of one variable" PPT courseware 11:

"Application of Linear Equations of One Variable" PPT courseware 11 The general process of using equations to solve practical problems is: 1. Review the question: analyze the meaning of the question to find out the quantities and their relationships in the question; 2. Set the elements: choose an appropriate unknown number to represent it with a letter (for example x); 3. List of equations: According to equality..

"Application of linear equations of one variable" PPT courseware 10:

"Application of Linear Equations of One Yuan" PPT Courseware 10 Economic Issues 1. Mom deposited 5,000 yuan in the bank as a one-year regular savings, with an annual interest rate of 1.98%. After maturity, the interest will be _____ yuan. Interest = principal interest rate period = 5000 1.98% 1 = 99 (yuan) 2. Mom...

"Application of linear equations of one variable" PPT courseware 9:

"Application of Linear Equations" PPT Courseware 9 Warm-up Game Six children came to the teacher's house. After playing for a while, they said they were hungry, but the teacher only found 5 cookies. How should they be divided equally among the 6 children? (Requirement: Each cookie can only be divided into 3 equal parts at most..

File Info

Update Time: 2024-11-15

This template belongs to Mathematics courseware Qingdao Edition Seventh Grade Mathematics Volume 1 industry PPT template

Preview