If 4: a=(1/2):0.8, then a=how much.
如果4：a=(1/2)：0.8，那么a=多少．
<gadget id="calculator">4 * 0.8</gadget>
<output>3.2</output>

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

<gadget id="calculator">3.2 / (1/2)</gadget>
<output>6.4</output>

<result>6.4</result>