100以內兩位數(shù)減一位數(shù)退位減法)

1、20-1 =41-8=30-4=30-2=33-7=30-8=36-8=33-4=20-9=37-8=22-8=21-5=30-6=23-4=31-3=21-3=23-6=40-6=21-6=23-9=31-6=40-8=24-5=35-8=21-9=24-7=30-仁40-7=32-6=30-3=31-8=34-8=30-5=24-8=30-9=20-3=33-6=31-2=20-5=42-6=31-5=20-7=24-9=31-9=21-2=25-6=32-3=21-4=25-9=32-4=21-7=26-7=32-5=22-3=27-8=22-4=22-5=28-9=41-6=22-7=

2、20-2=23-7=41-4=20-6=34-7=26-9=21-8=27-9=32-7=20-8=42-4=24-6=30-7=42-5=25-7=40-2=42-7=42-8=31-4=42-9=26-8=31-7=43-4=32-8=40-仁43-5=32-9=40-3=43-7=33-5=40-5=61-8=33-9=40-9=53-5=34-5=41-2=62-5=34-6=22-6=53-8=34-9=33-8=43-9=35-6=41-3=44-5=35-7=41-5=44-7=35-9=41-7=45-6=36-7=23-8=45-8=36-9=41-9=53-7=37-9=4

3、2-3=61-4=38-9=22-9=46-7=20-4=23-5=46-9=40-4=25-8=47-8=48-9=52-9=58-9=54-8=53-4=51-4=60-6=53-6=63-8=63-6=45-9=52-4=63-5=53-9=65-7=50-1 =54-5=63-7=50-3=46-8=52-6=50-5=61-7=64-6=50-7=60-8=57-8=55-8=54-6=60-1 =62-8=54-7=50-8=50-9=50-2=66-8=51-2=61-3=60-2=51-5=54-9=51-6=64-8=55-6=51-7=50-6=60-3=51-9=61-6

4、=60-4=52-3=55-7=51-8=52-7=55-9=60-5=43-6=56-7=60-9=44-8=56-9=61-2=52-8=57-9=61-5=61-9=65-6=82-6=43-8=65-9=71-8=44-6=66-7=71-9=44-9=66-9=72-3=45-7=67-8=85-8=60-7=68-9=72-4=56-8=70-1 =87-9=62-3=70-3=72-5=62-4=80-2=72-8=62-6=70-5=90-4=47-9=70-8=91-5=50-4=90-2=94-8=62-7=70-9=92-7=51-3=71-2=91-8=65-8=76-

5、9=72-9=62-9=71-3=73-4=63-4=71-4=73-6=63-9=82-4=90-3=64-5=83-7=73-7=64-7=84-6=73-8=52-5=71-6=90-6=64-9=71-7=73-9=74-6=96-7=81-3=74-9=95-8=90-7=75-6=94-6=81-4=75-8=93-7=81-6=67-9=80-仁81-7=83-8=80-3=91-3=92-8=80-4=81-8=75-9=73-5=83-5=76-7=92-5=81-9=70-6=80-5=82-3=75-7=71-5=82-5=76-8=80-6=82-7=77-8=90-8=82-9=82-8=74-7=83-4=84-7=80-7=83-9=77-9=80-8=84-5=78-9=91-4=84-8=70-4=74-8=72-6=83-6=80-9=91-7=96-8=81-2=84-9=95-7=81-5=85-6=93-8=74-5=85-7=92- 9=93- 4=93- 9=94- 5=94- 9=95- 6=95- 9=96- 9=97- 8=98- 9=72-7=92- 4=94-7=93- 6=85- 9=86