Calculate with a simple method: (5.4+3.6)*6.5+6.5.
用简便方法计算：(5.4+3.6)*6.5+6.5．
<gadget id="calculator">5.4 + 3.6</gadget>
<output>9</output>

<gadget id="calculator">9 * 6.5</gadget>
<output>58.5</output>

<gadget id="calculator">58.5 + 6.5</gadget>
<output>65</output>

<result>65</result>