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

70    0.01
分析:根據(jù)商不變性質(zhì):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;
求因數(shù),根據(jù):一個(gè)因數(shù)=積÷另一個(gè)因數(shù),解答即可.
解答:0.7÷0.51,
=(0.7×100)÷(0.51×100),
=70÷51;
因?yàn)?.068÷6.8=0.01,
所以0.01×6.8=0.068;
故答案為:
點(diǎn)評(píng):解答此題應(yīng)明確:只有被除數(shù)和除數(shù)同時(shí)擴(kuò)大或縮小相同的倍數(shù)(0除外),商才不變;用到的知識(shí)點(diǎn):因數(shù)、因數(shù)和積三者之間的關(guān)系.
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