Answer:
for 5/7 + 6/8 for example.
The answer is 82/56
Explanation:
Easy, just try this operation
5/7+6/8=82/56 because you need to cross multiply for the numerators, so 5*8 and 6*7. For the denominator For z/x+e/y most of the time the answer for the common denominator is xy or xy/r when r is a factor of both z and e. thats how you find the lcd.