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9÷3=(9×3)÷(3×3)成立的依据是


  1. A.
    商不变的性质
  2. B.
    乘除法的关系
  3. C.
    积与因数的关系
A
分析:根据题干观察可得,被除数和除数同时扩大3倍,商不变,这是利用了商不变的性质,由此即可进行选择.
解答:被除数和除数同时扩大或缩小相同的倍数,商不变,
所以9÷3=(9×3)÷(3×3)成立的依据是:商不变的性质;
故选:A.
点评:此题考查了商不变的性质的灵活应用.
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