295+328=?,300+446=?,671+704=?
514-13=?,885-366=?,934-280=?
40+?=682,493+?=746,293+?=964
40*7=?,6*127=?,822*4=?
204/3=?,648/8=?,738/9=?
---
?-248=809-330,121+255+355+298=?
780-346=?+275,491+366+247-990=?
297+?+252=991,567+257-304-318=?
497+?-671=404,999-154-394-425=?
提前放寒假