Simple calculation: ((7/13)+(7/9))/((4/13)+(4/9))
简便计算：((7/13)+(7/9))/((4/13)+(4/9))
<gadget id="calculator">7 / 13</gadget>
<output>7/13 = around 0.538462</output>

<gadget id="calculator">7 / 9</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">(7/13) + (7/9)</gadget>
<output>154/117 = around 1.316239</output>

<gadget id="calculator">4 / 13</gadget>
<output>4/13 = around 0.307692</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(4/13) + (4/9)</gadget>
<output>88/117 = around 0.752137</output>

<gadget id="calculator">(154/117) / (88/117)</gadget>
<output>7/4 = around 1.75</output>

<result>7/4 = around 1.75</result>