A rectangular plank has a circumference of 3m and a width of (1/2)m, what is its area m**2.
一块长方形木板，周长3m，宽是(1/2)m，它的面积是多少m**2．
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

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

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

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

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