Find the law first, and then add numbers according to the law: 6.4, 3.2, 1.6, how many 0.4, 0.2.
先找规律，再按规律添数：6.4，3.2，1.6，多少0.4，0.2．
<gadget id="calculator">1.6 / 2</gadget>
<output>0.8</output>

<result>0.8</result>