[tex] 1*\frac{1}{2} -(2,4+5,(6))=\frac{1}{2} -(2,4+5,(6))=0,5-2,4-5,(6)=-7,5(6) [/tex]
sau
[tex] 1*\frac{1}{2} -(2,4+5,(6))=\frac{1}{2}-(\frac{24}{10}+5\frac{6}{9}) =\frac{1}{2}-(\frac{24}{10}-\frac{51}{9})=\frac{1}{2}-\frac{24}{10}-\frac{51}{9}) =\\=\frac{1*45-24*9-51*10}{90}=\frac{45-216-510}{90}= - \frac{681}{90} =7\frac{51}{90} [/tex]
