Question

$\frac{1}{2}$·0,5-0,25

Answer 1

1/2 * 1/2 - 1/4 = 1/4 - 1/4 = 0

Answer 2

1 / 2 x 0,5 - 0,25 = 

= 1 / 2 x 5 / 10 - 25  / 100

= 1 / 2 x 1 / 2 - 1 / 4 

= 1 / 4 -  1 / 4 

= 0