△+○=60,○+□=51,□+△=39,□=_.△=_,○=_.

问题描述:

△+○=60,○+□=51,□+△=39,□=______.△=______,○=______.

△+○=60,所以△=60-○;因为○+□=51,所以□=51-○;
因为□+△=39,
即51-○+(60-○)=39,
          111-2○=39,
○=36;
所以△=60-○=60-36=24;
□=51-○=51-36=15;
故答案为:15,24,36.