题目内容

27.109是由2个______,7个______,1个______和9个______组成,它的计数单位是______.
27.109是由2个十,7个一,1个 0.1和9个0.001组成,它的计数单位是0.001.
故答案为:十,一,0.1,0.001,0.001.
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