If one side of a square is reduced by 10% and the other side is increased by 1 meter, the resulting rectangle has the same area as the original square. What is the area of the original square in square meters?
把一个正方形的一边减少10%，另一边增加1米，得到的一个长方形与原来的正方形面积相等，那么，原来的正方形面积是多少平方米．
<gadget id="calculator">10 * 10</gadget>
<output>100</output>

<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

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

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

<gadget id="calculator">100 / 9</gadget>
<output>100/9 = around 11.111111</output>

<gadget id="calculator">(100/9) - 10</gadget>
<output>10/9 = around 1.111111</output>

<gadget id="calculator">1 / (10/9)</gadget>
<output>9/10 = around 0.9</output>

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

<result>81</result>