"Value of Algebraic Expressions" PPT courseware 2

Description

"Value of Algebraic Expressions" PPT courseware 2

learning target

1: Master the concept of the value of an algebraic expression and be able to find the value of an algebraic expression

2: Proficient in the process of finding the value of an algebraic expression

3: Master the transformation evaluation problems of simple algebraic expressions

1. Review:

1. What is algebraic expression?

2. Use algebraic expression:

(1) The square of the sum of a and b;

(2) The sum of the squares of the two numbers a and b;

(3) 50% of the sum of a and b.

3. Use language to describe the meaning of the algebraic expression 2n+10.

Typical examples

Example 1 When a=2, find the value of the algebraic expression 2a3+3a+5.

Solution: When a=2,

2a3+3a+5=2×23+3×2+5

=2×8+6+5

=27

Note: If the multiplication sign is omitted in the algebraic expression, it must be added when substituting for evaluation.

Math Applications

Example 3: The annual output value of a certain enterprise last year was a billion yuan, and this year it increased by 10% compared with last year. If it can grow at this rate next year, please predict how many billion yuan the annual output value of this enterprise will reach next year? If the annual output value last year was 200 million yuan, how many billion yuan is the expected annual output value next year?

Question 1 Last year’s annual output value was a billion yuan. This year it increased by 10% compared with last year. Then how many billion yuan is this year’s annual output value?

Question 2 If the company grows at a rate of 10%, how many billion yuan is the annual output value expected to reach next year?

Question 3 If last year’s annual output was 200 million yuan, how to predict next year’s annual output value?

Class exercises

1. When x=1/2, find the value of the algebraic expression x2-2x-1

2. When x=5, y=3, find the value of the algebraic expression -2x-2xy+y

3. When a= 7, b = 4, c = 0, find the value of algebraic formula 2a-b+3c

Class summary

Let’s talk about it:

What did we gain from today’s lesson?

1: Master the concept of the value of an algebraic expression and be able to find the value of an algebraic expression

2: Proficient in the process of finding the value of an algebraic expression

3: Master the transformation evaluation problems of simple algebraic expressions

Keywords: Value teaching courseware of algebraic expressions, Qingdao edition seventh grade mathematics volume PPT courseware download, seventh grade mathematics slide courseware download, value of algebraic expression PPT courseware download, .PPT format;

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"Value of Algebraic Expressions" PPT courseware 6:

"Value of Algebraic Expressions" PPT Courseware 6 Review: 1. What is a monomial? An algebraic expression that only contains the product of numbers and letters is called a monomial. 2. How to determine the coefficient and degree of a monomial? The sum of the exponents of all letters in a monomial is called the degree of the monomial. 3. What...

"Value of Algebraic Expressions" PPT courseware 5:

"Value of Algebraic Expression" PPT Courseware 5 Definition of the value of algebraic expression: According to the needs of the problem, use specific numerical values ​​to replace the letters in the algebraic expression, and calculate according to the operational relationships in the algebraic expression. The result obtained is called the value of the algebraic expression. Example 1 When a= When -2b=-3, find the algebraic expression 2..

"Value of Algebraic Expressions" PPT courseware 4:

"Value of Algebraic Expressions" PPT Courseware 4 Use matchsticks to build small fish as follows. (1) How many matchsticks are used to build n small fishes? (2) How many matchsticks are used to build 20 such small fishes? 100 What? The value of the algebraic expression: Substitute specific numerical values ​​in the algebraic expression according to the needs of the problem..

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Update Time: 2024-11-01

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

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