(1/819)+(1/2223)-(1/1197)=how much.
(1/819)+(1/2223)-(1/1197)=多少．
<gadget id="calculator">1 / 819</gadget>
<output>1/819 = around 0.001221</output>

<gadget id="calculator">1 / 2_223</gadget>
<output>1/2_223 = around 0.00045</output>

<gadget id="calculator">1 / 1_197</gadget>
<output>1/1_197 = around 0.000835</output>

<gadget id="calculator">(1/2_223) - (1/1_197)</gadget>
<output>-2/5_187 = around -0.000386</output>

<gadget id="calculator">(1/819) + (-2/5_187)</gadget>
<output>1/1_197 = around 0.000835</output>

<result>1/1_197 = around 0.000835</result>