"Application of Quadratic Equations of One Variable" PPT Courseware 2

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"Application of Quadratic Equations of One Variable" PPT Courseware 2

Review and Review 1

The general steps for solving word problems using equations are:

1. Review: Review the meaning of the question: What is known and what is sought? What is the relationship between the known and the unknown?

2. Assume: Assume an unknown number, the statement must be complete, and if there is a unit (the same), the unit must be indicated;

3. Column: Column algebraic expression, column equation;

4. Solution: Solve the equations listed;

5. Check: whether it is the root of the listed equation; whether it conforms to the meaning of the question;

6. Answer: The answer must also be a complete sentence, indicate the unit and be close to life.

The key to solving word problems using equations is:

Find the equality relationship.

Review and review 2

(1) A company’s sales revenue this year is a million yuan. If the annual growth rate is x, then the sales revenue after one year will reach a·(1+x) million yuan (expressed by algebraic formula)

(2) A company’s sales revenue this year is a million yuan. If the annual growth rate is

Open wisdom

1. The school library had 50,000 books at the end of last year, and it is expected to increase to 75,000 by the end of next year. Find the average annual growth rate in the past two years.

Analysis: Equality relationship: books after two years of average growth = 75,000 volumes.

2. The price of a certain drug has been reduced twice, and the retail price has been reduced to half of the original price. It is known that the percentage of the two price reductions is the same, find the percentage of each price reduction. (Accurate to 0.1%)

3. Xiaohong’s mother saved 5,000 yuan in one-year regular savings the year before last, and it will be automatically transferred after maturity. Interest tax will be deducted this year (interest tax is 20% of the interest), and a total of 5,145 yuan will be obtained. Find this kind of savings annual interest rate. (accurate to 0.1%)

4. Our municipal government is considering doubling the city’s net fiscal revenue in two years. So what should be the average annual growth rate of net fiscal revenue in the past two years?

Class summary

The general steps for solving word problems using equations are:

1. Review: Review the meaning of the question: What is known and what is sought? What is the relationship between the known and the unknown?

2. Assume: Assume an unknown number, the statement must be complete, and if there is a unit (the same), the unit must be indicated;

3. Column: Column algebraic expression, column equation;

4. Solution: Solve the equations listed;

5. Check: whether it is the root of the listed equation; whether it conforms to the meaning of the question;

6. Answer: The answer must also be a complete sentence, indicate the unit and be close to life.

General relationship on the problem of two average growth (decrease) rates:

a(1±x)2=A (where a represents the base number, x represents the growth (or decrease) rate, and A represents the new number)

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

"Applications of Quadratic Equations of One Variable" PPT courseware 4:

"Applications of Quadratic Equations" PPT Courseware 4 Review and Review We obtain the roots of quadratic equations by completing the square method. This method of solving quadratic equations is called solving by completing the square. ) using the matching method..

"Applications of Quadratic Equations of One Variable" PPT courseware 3:

"Application of Quadratic Equations" PPT Courseware 3 I am the best designer Example 1 There is a rectangular iron piece 40m long and 30m wide. Cut a congruent small square around it, and then fold it into an uncovered A rectangular box, and make the area occupied by the bottom area equal to the original rectangle..

"Applications of Quadratic Equations of One Variable" PPT courseware:

"Applications of Quadratic Equations" PPT courseware. What are the steps to solve word problems using equations? (1) Examination: refers to reading the question, clarifying the meaning of the question, clarifying which quantities are known, which are unknown quantities, and what the question requires; (2) Finding: looking for the equivalent relationship, that is, what is given in the question..

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Update Time: 2024-10-03

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

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