The upper base of a trapezoid is 4 cm, the lower base is 6 cm, and the height is 2 cm less than twice the lower base. What is the area of the trapezoid in cm**2.
一个梯形的上底是4cm，下底是6cm，高比下底的2倍少2cm，这个梯形的面积是多少cm**2．
<gadget id="calculator">4 + 6</gadget>
<output>10</output>

<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<gadget id="calculator">12 - 2</gadget>
<output>10</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">10 * 5</gadget>
<output>50</output>

<result>50</result>