If the number A is the sum of the numbers A and B (4/9), then how much is the number A equal to the number B?
如果甲数是甲、乙两数和的(4/9)，那么甲数是乙数的多少
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">1 - (4/9)</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">(4/9) / (5/9)</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>