9÷3=(9×3)÷(3×3)成立的依據(jù)是(  )
 
分析:根據(jù)題干觀察可得,被除數(shù)和除數(shù)同時(shí)擴(kuò)大3倍,商不變,這是利用了商不變的性質(zhì),由此即可進(jìn)行選擇.
解答:解:被除數(shù)和除數(shù)同時(shí)擴(kuò)大或縮小相同的倍數(shù)(0除外),商不變,
所以9÷3=(9×3)÷(3×3)成立的依據(jù)是:商不變的性質(zhì);
故選:A.
點(diǎn)評(píng):此題考查了商不變的性質(zhì)的靈活應(yīng)用.
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