两个数的商是0.81,除数缩小到原来的,被除数不变,商是 .
6:5== %= ÷20= (小数).
= : == ÷10= (填小数).
18÷ ==0.9:0.3=3: = :24.
÷15=0.8==16: = %= 折.
0.8==12÷ = 折= %