两个三角形面积相等,它们底边长的比是7:8,它们高的比是( ).
%=7÷8= (填小数).
13.5÷ ==0.45=18: = %
÷24=0.375=15: = :16= %
3÷5== %=9: = 折.
4:5= (填小数)=0.8: .