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

70    0.01
分析:根據商不變性質:被除數和除數同時擴大或縮小相同的倍數(0除外),商不變;
求因數,根據:一個因數=積÷另一個因數,解答即可.
解答:0.7÷0.51,
=(0.7×100)÷(0.51×100),
=70÷51;
因為0.068÷6.8=0.01,
所以0.01×6.8=0.068;
故答案為:
點評:解答此題應明確:只有被除數和除數同時擴大或縮小相同的倍數(0除外),商才不變;用到的知識點:因數、因數和積三者之間的關系.
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