"Fraction" PPT courseware 3

Description

"Fraction" PPT courseware 3

Think about it?

Two people, A and B, make certain machine parts. It is known that A can do 6 more reps per hour than B. The time it takes A to do 90 reps is equal to the time it takes B to do 60 reps. How many do A and B each do per hour?

1. A makes x parts per hour, and the time it takes to make 90 parts is 90÷x hours, which can also be expressed by the formula 90/x hours.

2. B makes (x-6) parts per hour, and the time it takes to make 60 parts is 60÷(x-6) hours, which can also be expressed by the formula 60/x-6 hours.

1. ⑴ Among the following four rational expressions, the fraction is ( )

A, 2x+5/-7 B, 1/3x C, x+8/8 D, -1/4+x/5

⑵When x=-1, which of the following fractions is meaningless ( )

A. x+1/x B. x/x-1 C. 2x/x+1 D. x-1/x

2. ⑴When x≠1/2, the fraction x-2/2x-1 is meaningful.

⑵When x=2, the value of the fraction x-2/2x-1 is zero.

3. It is known that when x=5, the value of the fraction 2x+k/3x-2 is equal to zero, then k=-10.

Fraction: Use A and B to represent two integers, and A÷B can be expressed in the form. If B contains letters, the formula is called a fraction.

Conditions for a fraction to be meaningful: the denominator of the fraction is not equal to zero

Conditions for the value of a fraction to be zero: the numerator of the fraction is equal to zero

And the denominator is not equal to zero

Keywords: Fraction courseware, New People's Education Edition eighth grade mathematics volume PPT courseware, eighth grade mathematics slide courseware download, fraction PPT courseware download, .ppt format

For more information about the "Fractions" PPT courseware, please click the Fractions ppt tab.

"Applications of Fractional Equations" PPT courseware 3:

"Applications of Fractional Equations" PPT Courseware 3 Review Review 1. Concept of fractional equations An equation containing an unknown number in the denominator is called a fractional equation. 2. Problem-solving ideas for solving fractional equations 3. Problem-solving steps for solving fractional equations Learning objectives: 1. Be able to analyze the meaning of the problem and find equivalent quantities..

"Applications of Fractional Equations" PPT courseware 2:

"Application of Fractional Equations" PPT Courseware 2 Quote: A and B are making certain machine parts. It is known that A makes 6 more parts per hour than B. The time it takes A to make 90 parts is the same as the time it takes B to make 60 parts. If the time is equal, how many parts can A and B each make per hour? equal amount..

"Applications of Fractional Equations" PPT courseware:

Summary of the "Applications of Fractional Equations" PPT courseware: Steps and methods for solving application problems with column fraction equations: 1. Review, set up, list, solve, test, and answer 2. Find equivalent relationships Summary Summary of solving column fraction equations General steps and precautions for application questions: (1) Question review:..

File Info

Update Time: 2024-11-03

This template belongs to Mathematics courseware People's Education Press Eighth Grade Mathematics Volume 1 industry PPT template

Preview