Knowledge points of scores

Definition of fraction: The formula in the form of is called fraction, where A and B are algebraic expressions and B contains letters.

To understand the concept of score, we should grasp the following points:

1, the fraction is the quotient of the division of two algebraic expressions. Among them, the numerator is divided, the denominator is divided, and the fractional line plays the role of divisor and bracket.

2. The numerator of a fraction may or may not contain letters, but the denominator of a fraction must contain letters to become a fraction.

3. Denominator cannot be zero.

The condition that the value of the score is 0:

When the numerator of a fraction is equal to 0 and the denominator is not equal to 0, the value of the fraction is 0. Even if b=0, the conditions are: a=0, b≠0.

The concept of fraction: when two integers are not divisible, a fraction appears; Similarly, when two algebraic expressions are not divisible, a fraction will appear. Generally, if A and B represent two algebraic expressions, and B contains letters, then the formula is a fraction. Algebraic expressions and fractions are collectively called rational forms.

General points of scores:

1. Total score: According to the basic properties of scores, the process of converting several scores with different denominators into scores with the same denominator and equal to the original score is called total score.

2. Simplest common denominator: generally, the product of the highest power of all factors of each denominator is taken as the common denominator, which is the simplest common denominator.

Reduction of scores:

1, reduction: the process of reducing the same common factor in the numerator and denominator of a fraction is called the reduction of the fraction.

2. simplest fraction: If the numerator and denominator of a fraction do not contain the same factor (except 1), then the fraction is called simplest fraction.