Calculation: (4/19)*(16/13)-(6/19)*(2/13).
计算：(4/19)*(16/13)-(6/19)*(2/13)．
<gadget id="calculator">4 / 19</gadget>
<output>4/19 = around 0.210526</output>

<gadget id="calculator">16 / 13</gadget>
<output>16/13 = around 1.230769</output>

<gadget id="calculator">(4/19) * (16/13)</gadget>
<output>64/247 = around 0.259109</output>

<gadget id="calculator">6 / 19</gadget>
<output>6/19 = around 0.315789</output>

<gadget id="calculator">2 / 13</gadget>
<output>2/13 = around 0.153846</output>

<gadget id="calculator">(6/19) * (2/13)</gadget>
<output>12/247 = around 0.048583</output>

<gadget id="calculator">(64/247) - (12/247)</gadget>
<output>4/19 = around 0.210526</output>

<result>4/19 = around 0.210526</result>