123除以123又123/332+(2/333+4/333*.+332/333)-(1/333+.+331/333) =123/[123+123/332]+[2/333-1/333]+[4/333-3/333]+...+[332/333-331/333] =123/[123(1+1/332]+[1/333]*166 =1/[333/332]+166/333 =332/333+166/333 ...