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（5）带答案

19+15 =42-30=13+15 =45-25 =21+25 =46-17=10+18 =45-40=14+19 =44-40=20+17 =13+17 =45-31 =23+21 =49-23