把7支红铅笔和3支蓝铅笔放在一个包里,让你任意摸出1支铅笔,摸出的铅笔是红铅笔的可能性是 .
18:( )==( )÷6==( )%
÷5===0.6=15÷ .
10: = :33≈ %
: =0.75= = %.
=0.75=9: .