461+306=?,231+476=?,471+765=?
746-56=?,996-625=?,928-102=?
15+?=807,286+?=761,363+?=911
74*7=?,9*65=?,745*4=?
488/8=?,720/5=?,684/6=?
---
?-275=818-432,180+132+478+115=?
780-245=?+336,579+358+261-998=?
221+?+392=938,467+449-259-367=?
239+?-594=475,999-296-118-450=?
踩桌换灯泡