800立方厘米=( )立方分米 9.12升 = ( )毫升 2.3立方米=( )立方分米=( )升
× = ×= × =1.
35× =0.5× =× =6÷ =1.
任何一个数(零除外)与它的倒数的乘积是1. .
× =× =× =9× =1.
和 互为倒数.