$\begin{array}{l}
a)\,\,\left( {2,04 + 3,4} \right):0,34\\
C1:\,\,\left( {2,04 + 3,4} \right):0,34\\
\,\,\,\,\,\,\,\,\,\, = 5,44:0,34\\
\,\,\,\,\,\,\,\,\,\, = 16\\
C2:\,\,\,\left( {2,04 + 3,4} \right):0,34\\
\,\,\,\,\,\,\,\,\,\, = 2,04:0,34 + 3,4:0,34\\
\,\,\,\,\,\,\,\,\,\, = 6 + 10\\
\,\,\,\,\,\,\,\,\,\, = 16\\
b)\,\,0,96:6 - 0,36:0,6\\
C1:\,\,\,0,96:6 - 0,36:0,6\\
\,\,\,\,\,\,\,\,\,\, = 0,16 - 0,6\\
\,\,\,\,\,\,\,\,\,\, = ....\,\left( {vo\,li,vi\,lop\,5\,chua\,hoc\,so\,am} \right)\\
C2:\,\,0,96:6 - 0,36:0,6\\
\,\,\,\,\,\,\,\,\,\, = 0,96:6 - \left( {0,36 \times 10} \right):\left( {0,6 \times 10} \right)\\
\,\,\,\,\,\,\,\,\,\, = 0,96:6 - 3,6:6\\
\,\,\,\,\,\,\,\,\,\, = \left( {0,96 - 3,6} \right):6\\
\,\,\,\,\,\,\,\,\,\, = ....\,\left( {vo\,li,vi\,lop\,5\,chua\,hoc\,so\,am} \right)
\end{array}$
