Calculation: 5.4*58+4.2*54.
计算：5.4*58+4.2*54．
<gadget id="calculator">5.4 * 58</gadget>
<output>313.2</output>

<gadget id="calculator">4.2 * 54</gadget>
<output>226.8</output>

<gadget id="calculator">313.2 + 226.8</gadget>
<output>540</output>

<result>540</result>