The height of a trapezoid is 1.2dm, the lower base is 1.5dm, and the upper base is 0.3dm shorter than the height. What is the area of the trapezoid in dm**2.
一个梯形的高是1.2dm，下底1.5dm，上底比高短0.3dm，这个梯形的面积是多少dm**2．
<gadget id="calculator">1.2 - 0.3</gadget>
<output>0.9</output>

<gadget id="calculator">0.9 + 1.5</gadget>
<output>2.4</output>

<gadget id="calculator">1.2 / 2</gadget>
<output>0.6</output>

<gadget id="calculator">2.4 * 0.6</gadget>
<output>1.44</output>

<result>1.44</result>