从题目中可知：明明+亮亮+晶晶=10.4 算式1明明+亮亮=6.2 算式2明明+晶晶=6.5 算式3算式2+算式3明明+亮亮+明明+晶晶=6.2+6.52个明明+亮亮+晶晶=12.7 算式4算式4-算式12个明明+亮亮+晶晶-明明-亮亮-晶晶=12.7-10.4明明=2.3元亮亮=6.2-2.3=3.9元晶晶=6.5-2.3=4.2元答：明明有2.3元，亮亮有3.9元，晶晶有4.2元。
