The upper base of a trapezoidal iron sheet is 2.5 decimeters, the lower base is 3.2 decimeters, and the height is 3 decimeters. What is the area of this sheet of iron?
一块梯形铁皮的上底为2.5分米，下底为3.2分米，高为3分米．这块铁皮的面积是多少？
<gadget id="calculator">2.5 + 3.2</gadget>
<output>5.7</output>

<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">5.7 * (3/2)</gadget>
<output>8.55</output>

<result>8.55</result>