Use the law to simplify complex fractions: simplify (((1234567891/1234567890)-(1234567890/1234567891))/((1/1234567890)+(1/1234567891)))=how much.
活用法则定律化简繁分数：化简(((1234567891/1234567890)-(1234567890/1234567891))/((1/1234567890)+(1/1234567891)))=多少．
<gadget id="calculator">1_234_567_891 / 1_234_567_890</gadget>
<output>1_234_567_891/1_234_567_890 = around 1</output>

<gadget id="calculator">1_234_567_890 / 1_234_567_891</gadget>
<output>1_234_567_890/1_234_567_891 = around 1</output>

<gadget id="calculator">(1_234_567_891/1_234_567_890) - (1_234_567_890/1_234_567_891)</gadget>
<output>2_469_135_781/1_524_157_876_253_619_990 = around 0</output>

<gadget id="calculator">1 / 1_234_567_890</gadget>
<output>1/1_234_567_890 = around 0</output>

<gadget id="calculator">1 / 1_234_567_891</gadget>
<output>1/1_234_567_891 = around 0</output>

<gadget id="calculator">(1/1_234_567_890) + (1/1_234_567_891)</gadget>
<output>2_469_135_781/1_524_157_876_253_619_990 = around 0</output>

<gadget id="calculator">(2_469_135_781/1_524_157_876_253_619_990) / (2_469_135_781/1_524_157_876_253_619_990)</gadget>
<output>1</output>

<result>1</result>