A trapezoid with an area of 2.4 square meters has an upper base of 1.4 meters and a height of 1.2 meters. What is the lower base in meters?
一个面积是2.4平方米的梯形，上底是1.4米，高是1.2米，下底是多少米．
<gadget id="calculator">2 / 1.2</gadget>
<output>1.666667</output>

<gadget id="calculator">2.4 * 1.666667</gadget>
<output>4.000001</output>

<gadget id="calculator">4.000001 - 1.4</gadget>
<output>2.600001</output>

<result>2.600001</result>