如图,AB=CD=EF=2,BC=DE=4,∠B=∠C=∠D=∠E=90°,AF的长为 .
18÷ == :75= %= 折.
14÷ =0.35= :60= %= : .
÷ == (填小数)== ÷24.
=== ÷ = (小数)
3÷5== ÷30=9: = 填小数.