triangular piece of land has an area of 5 hectares and a height of 100 meters. What is the base in meters?
一块三角形地，面积是5公顷，高是100米，底是多少米．
<gadget id="calculator">5 * 10_000</gadget>
<output>50_000</output>

<gadget id="calculator">2 / 100</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">50_000 * (1/50)</gadget>
<output>1_000</output>

<result>1_000</result>