将下列各数按从大到小的顺序排列.3.465 3.455 3.456 3.645 .
0.75= :8=15÷ == %
= :24== %=.
甲数除以乙数的上是2.75,那么甲数与乙数的最简整数比是 .
= ÷ = %=6: .
÷20=0.8==20÷ = %