The area of a parallelogram is that of a trapezoid (1/2), how much more is the area of the trapezoid than the area of the parallelogram?
平行四边形的面积是梯形的(1/2)，梯形面积比平行四边形面积多百分之几？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

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

<result>1</result>