100 different denominator fraction addition and subtraction questions must have answers

The addition and subtraction of different denominators must be divided first.

Reduction of fractions to a common denominator is the process of converting several fractions with different denominators into fractions (formulas) with the same denominator equal to the original fractions (formulas) according to the basic properties of fractions (formulas), which is called general fractions.

Both the general fraction and the reduction are based on the basic properties of fractions: the numerator and denominator of fractions are multiplied or divided by a number that is not equal to zero, and the size of the fraction remains the same. The denominator does not change, and the numerator and denominator of the other side are cross-multiplied.

Key points

The key to the general division is to determine the simplest common denominator of several fractions, and the steps are as follows:

1.The divisor of each denominator is listed separately;

2.Multiply the divisors of the denominators, if there is a common divisor.

Multiply it only once, and the result is the least common multiple of each denominator.

3.Where a letter appears or a factor containing a letter.

The factor of the power of the base should be taken;

As follows:

The denominator is the same first, and then the fraction is reduced.

Subtracting several numbers in a row is equal to subtracting the addition of these numbers.

The same denominator is calculated first.

The symbol precedes the next number and moves with the symbol.

There is no skill in this, only a score.

6) 1 + (1 3-1 6) = 1 + (2 6-1 6) = 1 + 1 6 = 1 and 1 6

Don't forget to multiply molecules.

Multiplication and division. 1. The fraction is multiplied by an integer, the denominator remains unchanged, the numerator is multiplied by an integer, and finally the offer score that can be reduced.

2. Multiply the fraction by the fraction, multiply the numerator by the numerator, multiply the denominator by the denominator, and finally the offer score that can be reduced.

3. The fraction is divided by an integer, the denominator remains unchanged, if the numerator is a multiple of the integer, the numerator is divided by the integer, and finally the offer score that can be reduced to a fraction.

4. The fraction is divided by an integer, the denominator remains unchanged, if the numerator is not a multiple of the integer, then multiply this fraction by the reciprocal of the integer, and finally the offer score that can be reduced.

5. The fraction is divided by the fraction, which is equal to the reciprocal of the dividend multiplied by the divisor, and the last offer point that can be reduced.

9 7 - 2 7 10 21)

Please laugh, I've done my best.

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Example. Note: The front is the molecule, and the back is the molecule, such as 2 3 is two-thirds) according to the law. You can write as much as you want, and you're not tired

Teach you one more trick:

That is, 1 n 1 (n 2) = 1 (n 2) Let's take two more examples.

Note: The front is the numerator, and the back is the numerator, e.g. 2 3 is two-thirds).

It's really good, the teacher asked me to write 50 questions, and I looked for this directly.

This practice question is so useful, thanks thanks