Simple calculation: ((4/13)-(2/7)+(6/17))/((15/17)+(10/13)-(5/7)).
简便计算：((4/13)-(2/7)+(6/17))/((15/17)+(10/13)-(5/7))．
<gadget id="calculator">4 / 13</gadget>
<output>4/13 = around 0.307692</output>

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

<gadget id="calculator">(4/13) - (2/7)</gadget>
<output>2/91 = around 0.021978</output>

<gadget id="calculator">6 / 17</gadget>
<output>6/17 = around 0.352941</output>

<gadget id="calculator">(2/91) + (6/17)</gadget>
<output>580/1_547 = around 0.374919</output>

<gadget id="calculator">15 / 17</gadget>
<output>15/17 = around 0.882353</output>

<gadget id="calculator">10 / 13</gadget>
<output>10/13 = around 0.769231</output>

<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">(10/13) - (5/7)</gadget>
<output>5/91 = around 0.054945</output>

<gadget id="calculator">(15/17) + (5/91)</gadget>
<output>1_450/1_547 = around 0.937298</output>

<gadget id="calculator">(580/1_547) / (1_450/1_547)</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>