一年级50以内加法减法口算混合练习题五三天天练精华版（1）带答案

10+21 =41-39=23+12 =50-13 =15+19=44-23 =12+10 =42-35 =19+24=45-11 =24+19=18+14=41-10=22+18 =45-25 =2