The area of a rectangular table is 1 square meter. The side length of a square table is (9/10) meters. How much more square meters is the area of the rectangular table than the square?
一张长方形桌面的面积是1平方米．一张正方形桌面边长是(9/10)米．长方形桌面的面积比正方形的多多少平方米？
<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">(9/10) * (9/10)</gadget>
<output>81/100 = around 0.81</output>

<gadget id="calculator">1 - (81/100)</gadget>
<output>19/100 = around 0.19</output>

<result>19/100 = around 0.19</result>