237+598=?,267+522=?,440+650=?
773-29=?,812-224=?,863-315=?
42+?=821,202+?=891,354+?=958
73*4=?,49*7=?,75*6=?
318/3=?,608/4=?,738/9=?
---
?-267=725-420,115+202+340+151=?
850-249=?+385,383+205+228-619=?
276+?+333=954,417+200-169-303=?
263+?-457=368,999-356-177-322=?
唱动听歌谣