小学一年级下册100以内两位数混加混减计算题

40-15+23= 41+29+29= 41-23+32= 33-19+33= 33+19+19= 45-16+55= 45+16+14= 17+28+28= 53+39-17= 28+35-18= 94-16-9= 35-28+59=...