Write two fractions where the lcd is 20, but the product of the denominators is not 20

and  

Step-by-step explanation:

To calculate the Least Common Denominator (LCD) of two fractions you must descompose each denominators into their prime factors and multiply the commons and non-commons with the largest exponent.

Let's write the following two fractions:

and  

The LCD is:

So, we have two fractions where LCD is 20.

Let's verify that product of the denominators is not 20:

(The product is not 20).

for ex: the reciprocal of 3/4 is 4/3. it is the opposite.

reciprocal definition:

a mathematical expression or function so related to another that their product is one; the quantity obtained by dividing the number one by a given quantity.

5 x 14?

im new, sorry if this is wrong.

step-by-step explanation: