1-(1/6)+(1/42)+(1/56)+(1/72).
1-(1/6)+(1/42)+(1/56)+(1/72)．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/6)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 / 42</gadget>
<output>1/42 = around 0.02381</output>

<gadget id="calculator">1 / 56</gadget>
<output>1/56 = around 0.017857</output>

<gadget id="calculator">1 / 72</gadget>
<output>1/72 = around 0.013889</output>

<gadget id="calculator">(5/6) + (1/42) + (1/56) + (1/72)</gadget>
<output>8/9 = around 0.888889</output>

<result>8/9 = around 0.888889</result>