∵□+△+△=1300
∴□=1300--△--△
∵□+△+△+△+△=2500
将□=1300--△--△代入□+△+△+△+△=2500:1300--△--△+△+△+△+△=2500
1300+△+△=2500
2△ =1200
△ =600
将 △ =600代入□+△+△=1300:□+600+600=1300
□ =100
∵□+△+△=1300
∴□=1300--△--△
∵□+△+△+△+△=2500
将□=1300--△--△代入□+△+△+△+△=2500:1300--△--△+△+△+△+△=2500
1300+△+△=2500
2△ =1200
△ =600
将 △ =600代入□+△+△=1300:□+600+600=1300
□ =100