5.9807保留一位小数是 ,保留两位小数是 ,精确到千分位是 .
0.8=12÷ = :10= %
÷ =8﹕ = ﹕15==.
%=15÷ ==0.3: =0.75= 折= (填成数).
÷ ==.
÷20==36: = 折= %.