Arithmetic Operations

(a/b) / (c/d) = (a/b) * (c/d) = (ad)/(bc)	(a/(b/c) ) = (ac)/b
(a-b)/(c-d) = (b-a) / (d-c)	( (a/b)/c ) = a/(bc)
( (a+b) /c ) = (a/c) + (b/c)	a(b/c) = (ab)/c
(a/b) + (c/d) = (ad + bc)/(bd)	(ab+ac)/a = b+c
ab + ac = a(b+c)