The product of a number and (8/9) is 1, what is the number.
一个数与(8/9)的积是1，这个数是多少．
<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">1 / (8/9)</gadget>
<output>9/8 = around 1.125</output>

<result>9/8 = around 1.125</result>