If the base of a parallelogram is reduced by 1/3, how much should the height be increased to keep its area constant?
一个平行四边形的底减少(1/3)，要使它的面积不变，高应该增加多少
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / (2/3)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(3/2) - 1</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>