2. Take the least common multiple of denominator coefficient;

3. All the letters or factors based on letters should be taken;

4. The factor with the same letter or the power of the factor with the letter takes the largest exponent;

5. Multiply all the above formulas to get the simplest common denominator;

6. Multiply the numerator and denominator of the original fraction by an appropriate algebraic expression to simplify the denominator of each fraction to the simplest common denominator.