ball falls freely from a height of 15m, bounces up immediately after reaching the ground, falls again, and bounces again... Each time the height of the bounce is (4/5) of the height of the previous drop, then the third bounce What is the height of m.
一个皮球从15m高的地方自由落下，到达地面后又立即弹起，再落下，又弹起…每次弹起的高度都是前一次落下高度的(4/5)，则第三次弹起的高度是多少m．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">15 * (4/5) * (4/5) * (4/5)</gadget>
<output>192/25 = around 7.68</output>

<result>192/25 = around 7.68</result>