Simple calculation: 7.23-6.84-0.84+2.77.
简便计算：7.23-6.84-0.84+2.77．
<gadget id="calculator">7.23 - 6.84 - 0.84</gadget>
<output>-0.45</output>

<gadget id="calculator">(-0.45) + 2.77</gadget>
<output>2.32</output>

<result>2.32</result>