Simple operation: (16/9)-((7/9)+(7/11))
简便运算：(16/9)-((7/9)+(7/11))
<gadget id="calculator">16 / 9</gadget>
<output>16/9 = around 1.777778</output>

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

<gadget id="calculator">7 / 11</gadget>
<output>7/11 = around 0.636364</output>

<gadget id="calculator">(7/9) + (7/11)</gadget>
<output>140/99 = around 1.414141</output>

<gadget id="calculator">(16/9) - (140/99)</gadget>
<output>4/11 = around 0.363636</output>

<result>4/11 = around 0.363636</result>