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0.7÷0.51=________÷51
________×6.8=0.068.

70    0.01
分析:根据商不变性质:被除数和除数同时扩大或缩小相同的倍数(0除外),商不变;
求因数,根据:一个因数=积÷另一个因数,解答即可.
解答:0.7÷0.51,
=(0.7×100)÷(0.51×100),
=70÷51;
因为0.068÷6.8=0.01,
所以0.01×6.8=0.068;
故答案为:
点评:解答此题应明确:只有被除数和除数同时扩大或缩小相同的倍数(0除外),商才不变;用到的知识点:因数、因数和积三者之间的关系.
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