口算 24÷6=7×3=28÷7=72÷8+27=64÷8=12÷3=8÷4=4×8+23=45÷9=63÷9=9×6=49÷7×3=140+80=77+21=92-35=30-6+10=65+23=47+36=64+26=79-12=60+25=35+76=59+28=800-500=
解: 24÷6=4 | 7×3=21 | 28÷7=4 | 72÷8+27=36 | 64÷8=8 |
12÷3=4 | 8÷4=2 | 4×8+23=55 | 45÷9=5 | 63÷9=7 |
9×6=54 | 49÷7×3=21 | 140+80=220 | 77+21=98 | 92-35=57 |
30-6+10=34 | 65+23=88 | 47+36=83 | 64+26=90 | 79-12=67 |
60+25=85 | 35+76=111 | 59+28=87 | 800-500=300 |