The perimeter of an isosceles triangle is 14.5 cm, of which the base is 4.5 cm long. Find the waist of this isosceles triangle in centimeters. (solution by equation)
等腰三角形的周长是14.5厘米，其中底边长4.5厘米．求这个等腰三角形的腰是多少厘米．(用方程解)
<gadget id="calculator">14.5 - 4.5</gadget>
<output>10</output>

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

<result>5</result>