"Fraction" PPT courseware

Description

"Fraction" PPT courseware

Monomial: the product of a number and a letter or a letter and a letter

Polynomial: the sum of several monomials

Note: Algebraic expressions include integers, which means that integers are algebraic expressions but algebraic expressions are not necessarily integers.

annotation:

(1) The fraction is also an algebraic expression;

(2) A fraction is the quotient of two integers, and its form is A/B (where A and B are both integers and B is also required to be an integer containing letters)

(3) A is called the numerator of the fraction, and B is the denominator of the fraction.

Note: The values ​​of letters in the fraction cannot make the denominator equal to zero. Because when the value of the denominator is zero, the fraction is meaningless.

Do it

(1) When a=1,2, find the value of the fraction a+1/2a respectively.

(2) When a takes what value, the fraction a+1/2a is meaningless?

(3) When a takes what value, does the fraction a+1/2a make sense?

(4) When a takes what value, the value of the fraction a+1/2a is zero?

Two people A and B start from somewhere on a highway and go in the same direction. It is known that A travels a kilometers per hour, B travels b kilometers per hour, a>b. If B sets off 1 hour ahead of schedule, how long will it take for A to catch up with B? When a=6, b=5, find the time required for A to catch up with B?

Solution: According to the meaning of the question, the distance traveled by B for one hour is 1 × b (kilometers). A travels (a-b) kilometers further per hour than B. Therefore, the time required for A to catch up with B is

b÷(a-b)=b/a-b(hour)

When a=6, b=5, the time required for A to catch up with B is b/a-b=5/6-5=5

Answer: When A needs b/a-b to catch up with B. When a=6, b=5, it takes 5 hours for A to catch up with B.

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Update Time: 2024-11-21

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

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