Question

( 1 1 ) ( 3 1 )
__ + __ __ - __
1 2 1 2

Answer 1

$(\frac{1}{1} + \frac{1}{2} ).( \frac{3}{1} - \frac{1}{2} )=( \frac{2}{2} + \frac{1}{2} ).( \frac{6}{2} - \frac{1}{2} )=( \frac{3}{2} ).( \frac{5}{2} )= \frac{15}{4} ok$

Answer 2

(1/1 +1/2). (3/1-1/2) =
(2/2+1/2). ¨(6/2- 1/2)=
(3/2) . (5/2) =
15/4