A total of 10 trees are planted on one side of the road from the beginning to the end, and the distance between every two trees is 8 meters. How long is the road in meters?
一条马路的一边从头到尾共种了10棵树，每两棵树之间相隔8米，这条马路长多少米？
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">9 * 8</gadget>
<output>72</output>

<result>72</result>