解:V1:V2=(H1:H2)^3当圆锥尖向下时,V2=8V1=80ml,所以再加70ml(V2为添满时体积) 当圆锥尖向上时,v2=v1/8(V1为满时的体积),且V1=10+V2,所以V2=10/7ml,所以再加10/7ml