Simple calculation: 4.12+41.2*9.9.
简便计算：4.12+41.2*9.9．
<gadget id="calculator">41.2 * 9.9</gadget>
<output>407.88</output>

<gadget id="calculator">4.12 + 407.88</gadget>
<output>412</output>

<result>412</result>