Question

If a / b = c / d, then (a ± b) / b = 

Answer 1

Proportion :

If a / b = c / d, then (a ± b) / b = (c ± d) / d, and (a - b) / (a + b) = (c - d) / (c + d)

Answer 2

Holaaa Mate

Refer to the attachment...