3.21平方米=______升=______毫升,7.2升=______立方厘米=______立方米.
3.21平方米=3210升=3210000毫升;
7.2升=7200立方厘米=0.0072立方米.
故答案为:3210,3210000,7200,0.0072.
3.21平方米=______升=______毫升,7.2升=______立方厘米=______立方米.
3.21平方米=3210升=3210000毫升;
7.2升=7200立方厘米=0.0072立方米.
故答案为:3210,3210000,7200,0.0072.