(7/9)+6.28+(2/9)-4.28.
(7/9)+6.28+(2/9)-4.28．
<gadget id="calculator">7 / 9</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">(2/9) - 4.28</gadget>
<output>-4.057778</output>

<gadget id="calculator">(7/9) + 6.28 + (-4.057778)</gadget>
<output>3</output>

<result>3</result>