文档介绍：两位数加减一位数的进位加法、退位减法口算练****题(一)14+6=       18+2=       16+4=       24+6=       27+3=      90-1=       80-2=       70-3=       20-4=       30-5=      28+3=       35+5=       36+4=       45+5=       48+2=      80-6=       70-7=       51-5=       41-6=       21-7=      54+7=       45+7=       48+4=       36+7=       49+2=      61-8=       62-9=       63-4=       43-5=       33-6=      49+3=       56+6=       63+8=       64+6=       54+6=      23-7=       51-9=       60-8=       30-9=       11-2=      56+5=       63+7=       49+1=       64+7=       72+8=      71-3=       61-4=       14-7=       84-8=       94-9=      16+5=       18+3=       24+7=       27+5=       28+6=      25-6=       42-3=       52-4=       42-5=       52-6=      35+6=       16+6=       18+5=       27+6=       28+4=      70-7=       86-7=       80-8=      40-9=       51-2=      36+8=      45+6=       48+3=       54+8=      49+4=      51-3=       61-4=      75-9=       16-8=       96-9=      56+7=       16+7=       18+4=      27+4=       28+5=      67-8=      78-9=       67-9=       32-5=      72-6=      36+5=       45+8=      48+6=       49+5=       56+4=      16-8=       46-9=       51-9=      22-3=       22-4=      18+6=      27+7=       28+2=       36+6=      27+8=      23-9=       94-5=      77-8=       60-4=       80-5=      48+5=       49+6=       18+8=      48+7=       18+7=      50-6=      60-7=       90-8=