454+356=?,267+400=?,475+704=?
750-20=?,989-641=?,988-103=?
56+?=808,281+?=740,396+?=952
94*3=?,75*7=?,243*4=?
427/7=?,998/2=?,792/6=?
---
?-261=832-486,142+139+411+181=?
704-217=?+358,522+326+239-919=?
205+?+372=947,439+450-278-333=?
254+?-554=448,999-236-155-495=?
然后胡萝卜