If the difference between two adjacent odd numbers is 90% less than their sum, what is the product of these two odd numbers?
相邻的两个奇数的差比它们的和小90%，这两个奇数的积等于多少．
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 - (9/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">2 / (1/10)</gadget>
<output>20</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">10 + 1</gadget>
<output>11</output>

<gadget id="calculator">9 * 11</gadget>
<output>99</output>

<result>99</result>