Calculate with a simple method: 6.4*0.25+3.6/4.
用简便方法计算：6.4*0.25+3.6/4．
<gadget id="calculator">6.4 * 0.25</gadget>
<output>1.6</output>

<gadget id="calculator">3.6 / 4</gadget>
<output>0.9</output>

<gadget id="calculator">1.6 + 0.9</gadget>
<output>2.5</output>

<result>2.5</result>