The length of a rectangle is (5/7) meters and the width is (2/7) meters. What is the perimeter of the rectangle in meters?
一个长方形的长是(5/7)米，宽是(2/7)米，这个长方形的周长是多少米？
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">(5/7) + (2/7)</gadget>
<output>1</output>

<gadget id="calculator">1 * 2</gadget>
<output>2</output>

<result>2</result>