Example 1:

Q: What fraction of B is A?

Solution: Let a fraction be X, then the topic A is X of B, and then there is an equation: a=bx.

Solve the equation to get x = a/b.

So a is a/b of B.

Example 2:

For example, Xiao Ming has ten apples and eats three, so Xiao Ming eats 3/ 10 apples, taking the whole A as the denominator, a small part as the molecule B, and b/a means that B is the fraction of A. ..

Extended data:

Generally speaking, if A and B(B is not equal to zero) represent two algebraic expressions, and B contains letters, then the formula A/B is called a fraction, where A is called a numerator and B is called a denominator. Fraction is an algebraic expression different from algebraic expression, and its value changes with the change of letter value in fraction.

Score condition:

1. The condition that the score is meaningful: the denominator is not 0.

2. The condition that the fractional value is 0: the numerator is 0 and the denominator is not 0.

3. The condition that the fractional value is a positive (negative) number: the numerator and denominator are positive with the same sign and negative with different signs.

4. Condition of fractional value 1: numerator = denominator ≠0.

5. The condition that the fractional value is-1: the numerator and denominator are opposites, and neither is 0.

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