The sum of two numbers is (8/9), one number is (1/9), what is the other number?
两个数相加是(8/9)，一个数是(1/9)，另一个数是多少？
<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">(8/9) - (1/9)</gadget>
<output>7/9 = around 0.777778</output>

<result>7/9 = around 0.777778</result>