50cm= dm 4m= cm 7km60m= m.
1的倒数是 ,的倒数是 ,0.84的倒数是 .
因为×=1,所以和都是倒数. .(判断对错)
× =1.5× =× =1.
× =× =1.
的倒数是 ,的倒数是 .