A trapezoid with an area of 6.3m**2 has an upper base of 1.4m, a height of 1.2m, and a lower base in m.
一个面积是6.3m**2的梯形，上底是1.4m，高是1.2m，下底是多少m．
<gadget id="calculator">2 / 1.2</gadget>
<output>1.666667</output>

<gadget id="calculator">6.3 * 1.666667</gadget>
<output>10.500002</output>

<gadget id="calculator">10.500002 - 1.4</gadget>
<output>9.100002</output>

<result>9.100002</result>