首先列出303030的因数: 因为30÷1=3030\\div1 = 3030÷1=30,30÷2=1530\\div2 = 1530÷2=15,30÷3=1030\\div3 = 1030÷3=10,30÷5=630\\div5 = 630÷5=6,30÷6...