Xiao Ming is taller than Xiao Ming (1/7), then Xiao Liang is shorter than Xiao Ming by how much.
小明身高比小亮高(1/7)，则小亮身高比小明矮多少．
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(1/7) - 1</gadget>
<output>-6/7 = around -0.857143</output>

<gadget id="calculator">1 + (-6/7)</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 + (1/7)</gadget>
<output>8/7 = around 1.142857</output>

<gadget id="calculator">(1/7) / (8/7)</gadget>
<output>1/8 = around 0.125</output>

<result>1/8 = around 0.125</result>