Calculation: (9/8)-(1/7)+(1/8)-(6/7).
计算：(9/8)-(1/7)+(1/8)-(6/7)．
<gadget id="calculator">9 / 8</gadget>
<output>9/8 = around 1.125</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(9/8) - (1/7)</gadget>
<output>55/56 = around 0.982143</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">(1/8) - (6/7)</gadget>
<output>-41/56 = around -0.732143</output>

<gadget id="calculator">(55/56) + (-41/56)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>