18的约数有 ,在这些约数中,选出四个数组成一个比例式是 .
小数=6:5==36÷ = %
÷25= :8=27÷ =3.
0.75=12÷ = :12== %= 折.
0.75=12÷ =9: = %
0.7=7÷ = :30== %