In a basketball game, there are a total of 9 teams participating. If there is a game between every two teams, how many games will be played in total?
在一次篮球比赛中，一共有9支队伍参加，如果每两支队伍之间都要进行比赛的话，一共要进行多少场比赛．
<gadget id="calculator">9 - 1</gadget>
<output>8</output>

<gadget id="calculator">9 / 2</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">8 * (9/2)</gadget>
<output>36</output>

<result>36</result>