60的因数质数有()合数有() 7立方分米等于几分之几 370毫升等于几分之几 13时等于几分之几日
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1立方分米 = 1000立方厘米 = 0.001立方米

1000毫升 = 1立方分米 = 1升 = 0.001立方米

24时 = 1日

13时= 13/24 日

3.8*39 +3.9

=3.8*39 +3.8+0.1

=3.8*(39+1)+0.1

=3.8*40+0.1

=152+0.1

=152.1