高分求救,数学计算问题,各位兄弟指教?? 在线等待!!!

1：X=4743988.152   2：X =4744064.003    3：X =4743991.935   4：X =4743916.086
   Y=490582.493       Y =490679.832        Y =490735.986       Y=490638.649 转换后:
1:  X=4744912.093  2: X=4744989.677    3: X=4744918.609      4: X=4744841.027
    Y=613232.376      Y=613328.364        Y=613385.801          Y=613289.814这是1.5度带到3度带的坐标转换,  问这是怎么转换的?  怎样的公式??