Options: 1, B 2, C 3, C 4, B 5, C 6, d.
Three. 1, 5 2, 123 3, 15/8 4, 1004.8 cubic centimeters.
Four. 1,( 1)8 102n+4(2) 1 12(3) 100。
2、 12
3、920
4 2.9 1 (yuan) 5 24
Additional questions: 48%