\(12,67.3,4+12,67.5,6+12,67\)
\(=12,67\left(3,4+5,6+1\right)\)
\(=12,67.10=126,7\)
\(12,67\times3,4+12,67\times5,6+12,67\)\(=12,67\times\left(3,4+5,6\right)\)
\(=12,67\times8,8\)
\(=111,496\)
\(12,67.3,4+12,67.5,6+12,67\)
\(=12,67\left(3,4+5,6+1\right)\)
\(=12,67.10=126,7\)