Question

口算
（1）3.2×0.2             1.4×0.4          3.3÷3         1.2÷0.3
（2）2.5×0.4            1.5×2           0.7×7           7.3+0.3
（3）0.53-0.3            1.8×0.5          0.9×0.01       0.23×3
（4）0.56÷8            1.23×3           1.6÷0.04        7.3+2.7
（5）2-1.2              7.8÷6            8.4÷0.21        8.4÷0.7
（6）5.6+3.6           9-2.35             0.56÷8        1.23×3
（7）5.6÷0.4           4.5÷0.9           8.1×2         90÷3
（8）1.23+3            5.6+1.23          4.5×2         5.6÷1.4
（9）4.8÷1.2          7.2÷0.9          6.6÷1.1         7.2÷6
（10）2.1÷3            0.6×0.5          3.23×2         1.8÷3
（11）12.5÷0.1         0.32÷0.8         1.6+3.7          0.45×0.2
（12）0.36÷1.8         0.4×0.5           8.4+5.6        8.4÷2.1
（13）4.8÷0.08         4.8÷0.8           3+2.3          9.3÷3
（14）0.01×8          7.31×100         0.09×6        0.8×0.6
（15）1.25×8           3÷5              2.3+2.3        6.23+3.6．

Answer 1

口算
（1）3.2×0.2=0.64             1.4×0.4=0.56         3.3÷3=1.1         1.2÷0.3=4
（2）2.5×0.4=1                1.5×2=3             0.7×7=4.9           7.3+0.3=7.6
（3）0.53-0.3=0.23            1.8×0.5=0.9          0.9×0.01=0.009       0.23×3=0.69
（4）0.56÷8=0.07             1.23×3=3.69           1.6÷0.04=40        7.3+2.7=10
（5）2-1.2=0.8                7.8÷6=1.3            8.4÷0.21=40         8.4÷0.7=12
（6）5.6+3.6=9.2              9-2.35=6.65           0.56÷8=0.07        1.23×3=3.69
（7）5.6÷0.4=14              4.5÷0.9=5            8.1×2=16.2         90÷3=30
（8）1.23+3=4.23              5.6+1.23=6.83          4.5×2=9           5.6÷1.4=4
（9）4.8÷1.2=4               7.2÷0.9=8           6.6÷1.1=6           7.2÷6=1.2
（10）2.1÷3=0.7             0.6×0.5=0.3          3.23×2=6.46         1.8÷3=0.6
（11）12.5÷0.1=125          0.32÷0.8=0.4         1.6+3.7=5.3          0.45×0.2=0.09
（12）0.36÷1.8=0.2          0.4×0.5=0.2           8.4+5.6=14          8.4÷2.1=4
（13）4.8÷0.08=60            4.8÷0.8=6           3+2.3=5.3            9.3÷3=3.1
（14）0.01×8=0.08           7.31×100=731         0.09×6=0.54        0.8×0.6=0.48
（15）1.25×8=10             3÷5=0.6              2.3+2.3=4.6          6.23+3.6=9.83．