One addend is (5/9) and the other is (4/9), what is the sum?
一个加数是(5/9)，另一个加数是(4/9)，和是多少？
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(5/9) + (4/9)</gadget>
<output>1</output>

<result>1</result>