"Inequality" Inequality and Inequality Group PPT Courseware 4

Description

"Inequality" Inequality and Inequality Group PPT Courseware 4

Exercise 1: Express the following text problems using inequalities

1 a is a positive number

2 a is a negative number

3 The sum of a and 5 is less than the difference between 7 and X

4 The difference between a and 2 is not less than -1

5 The sum of b and 4 is not greater than 7

6 Half of X is not less than one quarter of Y

1 Solution to the inequality:

The value of the unknown that makes the inequality true is called the solution of the inequality

2 The following numbers 76, 73, 80, 74, 9, 75, 1, 90, 60

What are the solutions to the above inequalities 76 80 90

Solution set of inequalities

Generally, all solutions of an inequality containing unknown numbers form the solution set of this inequality.

Solving Inequalities

The process of finding the solution set of an inequality is called solving the inequality

Knowledge summary

1 What knowledge did you learn in this lesson?

2 Are there any questions that you don’t understand?

Knowledge test

1. Use inequalities to express the following problems

1 The difference between 3x and 1 is non-negative

2 The length of the rectangle is X and the width is half of the length. Their sum is not less than 30

3 The length of the rectangle is a, the width is (a-2), and the area exceeds the area of ​​the square with side length (a+1)

4 There are 4 members of Xiaohua’s family. The average housing area per person is less than 15 square meters. The total housing area of ​​Xiaolin’s family is Y square meters, which can be expressed as

Two choice questions

1 Among the following values ​​-3, -2, -1, 0, 1, 2, 3, there are solutions to the inequality 2X>4 ( )

A.4 B.3 C.2 D.1

2 Use an inequality to express "the difference between 2 times a and -1 is greater than 2". The correct answer is ( )

A 2a-1＞-2 B 2a-(-1)＞2

C 2【a-(-1)】＞-2 D 2(a+1)＞-2

Three column inequalities

A shopping mall plans to sell 1,170 computers in October. During the golden week from October 1st to 7th, it will carry out promotional activities. During these seven days, the average sales volume is 54 units per day. If this shopping mall wants to exceed the plan this month, the average sales volume in the next 24 days will be 1,170. At least how many units are sold every day? Assume that in the future, at least x units will be sold on average every day, then the inequality listed is:

fill in the blank

1 The number of solutions to equation 2X=7 is one

2 The number of solutions to the inequality 2X<7 is countless

where the solution for non-negative integers is 0 1 2 3

Keywords: teaching courseware for inequalities and groups of inequalities, teaching courseware for inequalities, PPT courseware for the second volume of seventh-grade mathematics published by the New People's Education Press, downloading of seventh-grade mathematics slideshow courseware, downloading PPT courseware for inequalities and groups of inequalities, downloading PPT courseware for inequalities, .ppt format

For more information about the PPT courseware "Inequalities, Inequalities and Groups of Inequalities", please click the Inequality ppt Inequality and Group of Inequality ppt tab.

"The Relationship between Functions, Equations, and Inequalities" Function PPT Courseware (Lesson 2):

"The Relationship between Functions, Equations, and Inequalities" Function PPT Courseware (Lesson 2) Part One: Learning Objectives 1. Master the existence theorem of function zeros, and be able to determine the number of function zeros. (Key points) 2. Understand that the bisection method is a common rule for finding approximate solutions to equations..

"The Relationship between Functions, Equations, and Inequalities" Function PPT Courseware (Lesson 1):

"The Relationship between Functions, Equations, and Inequalities" Function PPT Courseware (Lesson 1) Part One: Learning Objectives 1. Understand the concept of zero points of functions and the relationship between zero points of functions and roots of equations. (Difficulty) 2. Can find the zeros of a function. (Key points) 3..

"The relationship between functions, equations and inequalities" Function PPT (the existence of zero points and how to find their approximate values ​​in Lesson 2):

"The Relationship between Functions, Equations, and Inequalities" Function PPT (Existence of Zero Points and How to Find Approximations in Lesson 2) Part One Content: Learning Objectives: Use the existence theorem of function zero points to determine the existence of zero points of a function in a certain interval and the number of zero points will be determined according to...

File Info

Update Time: 2024-06-30

This template belongs to Mathematics courseware People's Education Press Seventh Grade Mathematics Volume 2 industry PPT template

Preview