Solve equation 0.5: x=(9/2):(3/5).
解方程0.5：x=(9/2)：(3/5)．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">0.5 * (3/5)</gadget>
<output>0.3</output>

<gadget id="calculator">9 / 2</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">0.3 / (9/2)</gadget>
<output>0.066667</output>

<result>0.066667</result>