If the base of a triangle is doubled and the height is reduced by 4 times, what is the area?
一三角形底扩大2倍，高缩小4倍，面积多少．
<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>