Resposta :
Olá!!
[tex](2)+(-3)+ \frac {1} {2} -9\\ \\ -1+\frac {1} {2} -9\\ \\ \frac {-1} {1}+\frac {1} {2}-9\\ \\ mmc\\ \\ \frac {-1.2} {1.2}+\frac {1} {2}-9\\ \\ \frac {-2} {2} +\frac {1} {2}-9\\ \\ \frac {-1} {2}-\frac {9} {1}\\ \\ mmc\\ \\ \frac {-1} {2} -\frac {9.2} {1.2}\\ \\ \frac {-1} {2} -\frac {18} {2}\\ \\ \frac {-19} {2}[/tex]