What is the formula that expresses (13/23) as the sum of three different fractional units.
把(13/23)表示成三个不同的分数单位和的式子是多少．
<gadget id="calculator">13 / 23</gadget>
<output>13/23 = around 0.565217</output>

<result>13/23 = around 0.565217</result>