2的倒数是 ;0.6与 互为倒数;最小合数的倒数是 ; 的倒数是0.5.
÷40=20: =0.8= : .
3÷ == :12=六成= %
0.25= ÷8== : .
40: =8:10= /5= (填小数)
=18: = ÷40= [填小数].