The area of a trapezoid is 47 square centimeters, its upper base is 6.8 cm, and its lower base is 13.2 meters. What is the height in cm? (Solution of column equation)
一个梯形的面积是47平方厘米，它的上底是6.8厘米，下底是13.2米，高是多少厘米？(列方程解)
<result>4.7</result>