如果甲÷乙=20,那么甲一定是乙的倍数,乙一定是甲的因数. . (判断对错)
12÷ ==== %= 折.
5: ==1.25=30÷ = %
1==3÷ = : = %= (填小数).
=2: =4÷ = %=0.4.
÷ =20: ==0.8= %= 折.