(1)3.03立方米=3030立方分米;
(2)0.58立方分米=580立方厘米;
(3)8.25升=8.25立方分米=0.00825立方米;
(4)35平方分米=0.35平方米;
(5)80平方分米=0.8平方米;
故答案为:3030,580,8.25,0.00825,0.35,0.8.
(1)3.03立方米=3030立方分米;
(2)0.58立方分米=580立方厘米;
(3)8.25升=8.25立方分米=0.00825立方米;
(4)35平方分米=0.35平方米;
(5)80平方分米=0.8平方米;
故答案为:3030,580,8.25,0.00825,0.35,0.8.