0.7÷0.51=______÷51
______×6.8=0.068.
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:
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