Calculation: ((1/143)+(1/77)+(1/91))/((20/99)+(1/9))-(2/91)=
计算：((1/143)+(1/77)+(1/91))/((20/99)+(1/9))-(2/91)=
<gadget id="calculator">1 / 143</gadget>
<output>1/143 = around 0.006993</output>

<gadget id="calculator">1 / 77</gadget>
<output>1/77 = around 0.012987</output>

<gadget id="calculator">1 / 91</gadget>
<output>1/91 = around 0.010989</output>

<gadget id="calculator">(1/143) + (1/77) + (1/91)</gadget>
<output>31/1_001 = around 0.030969</output>

<gadget id="calculator">20 / 99</gadget>
<output>20/99 = around 0.20202</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">(20/99) + (1/9)</gadget>
<output>31/99 = around 0.313131</output>

<gadget id="calculator">(31/1_001) / (31/99)</gadget>
<output>9/91 = around 0.098901</output>

<gadget id="calculator">2 / 91</gadget>
<output>2/91 = around 0.021978</output>

<gadget id="calculator">(9/91) - (2/91)</gadget>
<output>1/13 = around 0.076923</output>

<result>1/13 = around 0.076923</result>