There are 8 students participating in a chess competition, and every two students will play a game, how many games will be played in total.
有8名同学参加象棋比赛，每两人进行一场比赛，一共要进行多少场比赛．
<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">8 * (7/2)</gadget>
<output>28</output>

<result>28</result>