A number is still (2/3) after adding its (2/3), what is this number
一个数增加它的(2/3)后还是(2/3)，这个数是多少
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 + (2/3)</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">(2/3) / (5/3)</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>