The upper base of a trapezoid is 2 meters, the lower base is 5 meters, and the height is 3 meters. What is its area in square meters? ．
一个梯形的上底是2米，下底是5米，高是3米，它的面积是多少平方米．．
<gadget id="calculator">5 + 2</gadget>
<output>7</output>

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

<gadget id="calculator">7 * (3/2)</gadget>
<output>21/2 = around 10.5</output>

<result>21/2 = around 10.5</result>