When using a calculator to calculate 2160/20-57, press 2160 on the keyboard, then press "/", then press 20, and then press "-", then the screen should display how much.
在用计算器计算2160/20-57时，在键盘上按下2160接着按"/"，再按20，接着再按"-"，这时屏幕该显示多少．
<gadget id="calculator">2_160 / 20</gadget>
<output>108</output>

<result>108</result>