3 15 passes? 5 6 and 13 15 passes?

Solution: Two-thirds of 100 means 100x2 3. Then 100x2 3=(100x2) 3=200 3, i.e. two-thirds of 100 equals two-thirds of 200.

Extended Information: How to Calculate Scores 1Addition and subtraction of fractions (1) Addition and subtraction of fractions with the same denominator, the denominator remains unchanged, the addition and subtraction of the numerator becomes a new numerator, and the offer points that can be obtained are reduced.

Example: 3 10+2 10=(3+2) 10=5 10=1 2 (2) To add or subtract fractions with different denominators, first pass the dots and convert the scores with different denominators into fractions with the same denominator, and then according to the addition and subtraction of fractions with the same denominator, you can reduce the final offer score. Example:

2/3+3/4=8/12+9/12 2.Multiplication of fractions (1) The fraction is multiplied by an integer, the denominator does not change, the numerator is multiplied by the integer to become the new numerator, and the final result is separated. For example:

2 7x14=(2x14) 7=28 7=4 (2) The fraction is multiplied by the fraction, the denominator is multiplied by the new denominator, and the numerator is multiplied by the numerator as the new molecule, and the final result is approximately separated. For example: 3 4x4 7=(3x4) (4x7)=12 28=3 73, the division of fractions calculates (1) the fraction is divided by an integer, the numerator does not change, the denominator is multiplied by the integer as the new denominator, and finally the approximate result is obtained.

Example: 2 5 6=2 (5*6)=2 30=1 15 (2) The decimal divided by the decimal is equal to the reciprocal of the divisor multiplied by the divisor, and the final offer point can be reduced. Example:

3 15 is about the point. It's not a general score. So it is divided into:

Answer: 1 5 passes are scored as follows:

The common divisor of the general score is 3.

3/4 and 7/15 are divided into 4x15 603 4 3x15 4x15 45 607 15 7x4 15x4 28 60

3/15 is passed, the denominator numerator is divided by 3 at the same time, and the denominator numerator becomes 5 and 1 respectively, so the result is 1/5

3 15 = 1 5 This one is the easiest way to ventilate. It's equal to one in one.

Solution: 5/6 is equal to (25 30), and 13/15 is equal to (26 30).

It is known that 5/6 and 13/15 need to be divided. 5 out of six

13/15

Answer: A score of 5/6 is equal to 25 30, and a score of 13/15 is equal to 26 30

The sum of 3 and 2 5 and 7 is 17 5 + 7 15 = 102 30 + 14 30 = 116 Hongxiang 30 =.

3 and 2/5, i.e. 17 5

15 is the number of rounds of 5 and 15.

3 and 13 15

Take the least common multiple of 15 and 4 15*4=60

You can then add and subtract.

Summary. The least common multiple of 13 and 39 is 39

According to the basic nature of fractions, the process of converting several fractions with different denominators into fractions with the same denominator equal to the value of the original fraction is called a common fraction.

The least common multiple of 13 and 39 is 39

First find the least common multiple of the denominator 15 and 7, 15 and 7 are coprime, so it is 15*7=105

The numerator and denominator of 7 15 are multiplied by 7 to get 49 105

The numerator and denominator of 3 7 are multiplied by 15 to get 45 105