龙湖集团5月合约销售额64.7亿元人民币，1-5月累计合约销售额285.5亿元人民币。

Group 1 - The core point of the article is that Longfor Group reported a contract sales amount of 6.47 billion RMB in May, with a cumulative contract sales amount of 28.55 billion RMB from January to May [1] Group 2 - In May, the contract sales amount of Longfor Group reached 6.47 billion RMB [1] - The cumulative contract sales for the first five months of the year totaled 28.55 billion RMB [1]