小学二年级的增减

加减62-34+46 5438+0 = 62-35+13 = 63-49+12 = 52-17+19 = 91-37-23 = 27+16-23 = 62-49+54 = 78-39+36 = 22+28-65438

括号问题

35+(25-20) 178-(50+50) 53-(30-20) 52-(12+8) 45-(12+18) 100-(45+55)

23+(25-12 ) 156-(150+5) 34+(12-2) 78+(56-16)