Calculation: 20.8-((1/15)+(1/21))*105.
计算：20.8-((1/15)+(1/21))*105．
<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">1 / 21</gadget>
<output>1/21 = around 0.047619</output>

<gadget id="calculator">(1/15) + (1/21)</gadget>
<output>4/35 = around 0.114286</output>

<gadget id="calculator">(4/35) * 105</gadget>
<output>12</output>

<gadget id="calculator">20.8 - 12</gadget>
<output>8.8</output>

<result>8.8</result>