For a triangle, if the base is enlarged by 2 times and the height is reduced by 4 times, how many times will the area be reduced?
一个三角形，如果底扩大2倍，高缩小4倍，面积比原来缩小多少倍
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / (1/2)</gadget>
<output>2</output>

<result>2</result>