ft"><span style="font-size: medium">2 4</span></div>
<div style="text-indent: 21pt" align="left"><span style="font-size: medium">3 5</span></div>
<div style="text-indent: 21pt" align="left"><span style="font-size: medium">4 6</span></div>
<div style="text-indent: 21pt" align="left"><span style="font-size: medium">5 6</span></div>
<div align="left"><span style="font-size: medium">【样例输出1】</span></div>
<div style="text-indent: 21pt" align="left"><span style="font-size: medium">3.000</span></di