（1）9/2÷27=9/2×1/27=1/6
6/2÷18=6/2×1/18=1/6
3/2÷9=3/2×1/9=1/6
1/2÷（3）=1/2×1/3=1/6
（27/2）÷（81）=27/2×1/81=1/6
规律：被除数和除数同时扩大或缩小相同的倍数（0除外）,商不变.
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