Simple calculation: 200.2*7.8-7.8*0.2.
简便计算：200.2*7.8-7.8*0.2．
<gadget id="calculator">200.2 * 7.8</gadget>
<output>1_561.56</output>

<gadget id="calculator">7.8 * 0.2</gadget>
<output>1.56</output>

<gadget id="calculator">1_561.56 - 1.56</gadget>
<output>1_560</output>

<result>1_560</result>