rectangular table top is (5/4) meters long and (3/5) meters wide. A square desktop has an area of (9/10) square meters. How many square meters is the area of the rectangular table less than the area of the square table?
一个长方形桌面，长(5/4)米，宽(3/5)米．一个正方形桌面，面积是(9/10)平方米．长方形桌面的面积比正方形桌面的面积少多少平方米？
<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(5/4) * (3/5)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(9/10) - (3/4)</gadget>
<output>3/20 = around 0.15</output>

<result>3/20 = around 0.15</result>