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.
9: ==3÷5.
3÷4==27: = (填小数)= %.
÷4==0.25= :8.
=9÷ = :8== (填小数)
3: ==15÷ = ×= (小数).