The perimeter of an isosceles triangle is (4/5) centimeters, and the length of each waist is (1/3) centimeters. How many centimeters is the bottom?
一个等腰三角形的周长是(4/5)厘米，每条腰长(1/3)厘米，求底是多少厘米？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/3) * 2</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(4/5) - (2/3)</gadget>
<output>2/15 = around 0.133333</output>

<result>2/15 = around 0.133333</result>