=1/4-3/2+1/2.3/8
=1/4-3/2+3/16
=-5/4+3/16
=-20/16+3/16
=-17/16
25% - (1)1/2 + 0,5 . 3/8
\(=\dfrac{1}{4}-\dfrac{3}{2}+\dfrac{1}{2}.\dfrac{3}{8}\)
\(=\dfrac{1}{4}-\dfrac{3}{2}+\dfrac{3}{16}\)
\(=\dfrac{4}{16}-\dfrac{24}{16}+\dfrac{3}{16}\)
\(=\dfrac{-17}{16}\)