If x=2, then (1/2)x**2-(1/8)x**3=how much.
如果x=2，那么(1/2)x**2-(1/8)x**3=多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">(1/2) * 4</gadget>
<output>2</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">2 * 2 * 2</gadget>
<output>8</output>

<gadget id="calculator">(1/8) * 8</gadget>
<output>1</output>

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

<result>1</result>