2/9 + 1/3 : ( - 3/2 ) + 1/2; ( - 0,5)

Lời giải:

 \[\frac{2}{9} + \frac{1}{3}:\left( { - \frac{3}{2}} \right) + \frac{1}{2}\,\,.\,\,( - 0,5)\]

\[ = \frac{2}{9} + \frac{1}{3}.\,\,\frac{{ - 2}}{3} + \frac{1}{2}\,\,.\,\,\frac{{ - 1}}{2}\]

\[ = \frac{2}{9} + \frac{{ - 2}}{9} + \frac{{ - 1}}{4} = \frac{{ - 1}}{4}\];