Question

the sum of 5/21and4/7 by their difference​

Answer 1

.

Sum of 5/21 and 4/7 ---

--> 5/21 + 4/7

--> LCM is 21

--> 5+12/21

--> 17/21

Difference of 5/21 and 4/7 -----

--> 5/21 - 4/7

--> LCM is 21

--> 5-12/21

--> -7/21

--> -1/3

HOPE IT HELPS ...

Answer 2

Answer:

(5/21+4/7)/(5/21-4/7)

=(17/21)/(-7/21)

=-(17/7)

= -17/7 (Ans)