It is known that a is a natural number, A and B are numbers from 1 to 9, the difference of the simplest fraction ((a)/222)=0.3{_{A}**(•)}3{_{B}** (•)}. May I ask: How much is a?
已知a是一个自然数，A、B是1至9中的数字，最简分数差((a)/222)=0.3{_{A}**(•)}3{_{B}**(•)}．请问：a是多少？
<result>83</result>