The upper base of a trapezoid is 4.8 decimeters, the lower base is 5.2 decimeters, and the height is 5 decimeters. What is its area in square decimeters?
一个梯形的上底是4.8分米，下底是5.2分米，高是5分米，它的面积是多少平方分米
<gadget id="calculator">4.8 + 5.2</gadget>
<output>10</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">10 * (5/2)</gadget>
<output>25</output>

<result>25</result>