16.2÷（3.2×0.25+4.6）

解：16.2÷（3.2×0.25+4.6），
=16.2÷[0.8×（4×0.25）+4.6）]，
=16.2÷[0.8×1+4.6]，
=16.2÷5.4，
=3．
分析：先算括號內(nèi)的乘法，把3.2看作0.8×4，運(yùn)用乘法結(jié)合律簡算3.2×0.25，再算括號內(nèi)的加法，最后算括號外的除法．
點(diǎn)評：此題考查了小數(shù)的四則混合運(yùn)算的順序以及運(yùn)用合適的簡便方法計(jì)算．
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3.2×0.2             		 1.4×0.4           3.3÷3          1.2÷0.3
2.5×0.4             1.5×2            0.7×7           7.3+0.3
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（5）2-1.2               7.8÷6             8.4÷0.21         8.4÷0.7
5.6+3.6            9-2.35              0.56÷8         1.23×3
5.6÷0.4            4.5÷0.9            8.1×2          90÷3
1.23+3             5.6+1.23           4.5×2          5.6÷1.4
4.8÷1.2           7.2÷0.9           6.6÷1.1          7.2÷6
2.1÷3             0.6×0.5           3.23×2          1.8÷3
12.5÷0.1          0.32÷0.8          1.6+3.7           0.45×0.2
0.36÷1.8          0.4×0.5            8.4+5.6         8.4÷2.1
4.8÷0.08          4.8÷0.8            3+2.3           9.3÷3
0.01×8           7.31×100          0.09×6         0.8×0.6
1.25×8            3÷5               2.3+2.3         6.23+3.6

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（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．

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