Fractions
Law of fractions
(a / b) + (c / d) = (a d + b c) / (b d) (1)
(a / b) (c / d) = (a c) / (b d) (2)
(a / b) / (c / d) = (a / b) (d / c) (3)
(- a / b) = - (a / b) = a / (- b) (4)
[(a / b) + (c / d)] / [(e / f) + ( g / h)] = ([(a / b) + (c / d)] / [(e / f) + (g / h)]) ([b d f h] / [b d f h])
= [((a d) + (b c)) f h] / [((e h) + (f g)) b d] (5)