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999÷5=199…5,即小於1000自然數中能被5整除的數為199個,999÷7=142…6,即能被7整除的數有142個;1000÷(7×5)=28…20,即小於1000自然數中能同時被7和5整除數有28個.999-(199+142-28)=999-313=686(個);…
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