(1)6-
1
3 =5
2
3 (千克);
(2)6×(1-
1
3 ),
=6×
2
3 ,
=4(千克);
(3)390÷(1+30%),
=390÷130%,
=300;
(4)24×
3
4 =18;
(18+12) ÷
5
6 ,
=30 ÷
5
6 ,
=36;
故答案为:5
2
3 ,4,300,36.
(1)6-
1
3 =5
2
3 (千克);
(2)6×(1-
1
3 ),
=6×
2
3 ,
=4(千克);
(3)390÷(1+30%),
=390÷130%,
=300;
(4)24×
3
4 =18;
(18+12) ÷
5
6 ,
=30 ÷
5
6 ,
=36;
故答案为:5
2
3 ,4,300,36.