When multiplying rational expressions it is very straight forward. You simply multiply across.
Follow these simple steps:
1. Factor your fractions
2. Cancel out common factors in the pattern 3/1 +|- 1/2 +|- 2/ 3…
3. Multiply the numerators then multiply the denominators
4. You will now have your answer, add the non-permissible values (non-permissible values = numbers that the denominator cannot equal because the denominator will then equal 0)