There are 4 football teams, every two teams play a game, how many games are there in total
有4支足球队，每两支球队打一场比赛，一共要比赛多少场
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">4 * (3/2)</gadget>
<output>6</output>

<result>6</result>