如果除数是31,商是12,余数是20,那么被除数是 .
÷ ==3: = :24= (填小数)
0.12=== ÷ =24: .
:5=== ÷25= (写小数).
12÷ ==0.375= :64= ÷24.
=== ÷ = (小数)