The upper base of a trapezoid is 12 decimeters, 0.2 meters shorter than the lower base, and the height is 9 decimeters. What is the area of this trapezoid?
一个梯形的上底12分米，比下底少0.2米，高9分米，这个梯形的面积是多少？
<gadget id="calculator">0.2 * 10</gadget>
<output>2</output>

<gadget id="calculator">12 + 12 + 2</gadget>
<output>26</output>

<gadget id="calculator">9 / 2</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">26 * (9/2)</gadget>
<output>117</output>

<result>117</result>