$$\left. \begin{array} { l } { A C - A B = 268 a , A } \\ { m / B = 60 ^ { \circ } B C = 7 } \\ { \text { . o \right.$$
$A\in \mathrm{R}\text{, }C=B\text{, }B\neq 0\text{, }a=0\text{, }m=60B^{3}\text{, }b=A$
$A=\frac{268a}{C-B}\text{, }C=B+\frac{268a}{b}\text{, }B\neq 0\text{, }a\neq 0\text{, }m=60CB^{2}\text{, }b\neq 0$
$A=0\text{, }C\neq B\text{, }B\neq 0\text{, }a=0\text{, }m=60CB^{2}\text{, }b=0$
