The height of a trapezoid is 1.2 decimeters, the sum of the upper and lower bases is 5 times the height, what is the area in square decimeters?
一个梯形的高是1.2分米，上底与下底的和是高的5倍，面积是多少平方分米．
<gadget id="calculator">1.2 * 5</gadget>
<output>6</output>

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

<gadget id="calculator">6 * 0.6</gadget>
<output>3.6</output>

<result>3.6</result>