19.594保留整数是 ,精确到小数点后第二位是 .
:56==12÷ =.
6: ==3:4=15÷ = 小数.
8: ==4:5=20÷ = 填小数.
= ÷ == 填小数= 折.
3:4=6: ==15÷ = 小数.