1949*((1/51)-(1/2000))+51*((1/1949)-(1/2000))-2000*((1/1949)+(1/51))+3.
1949*((1/51)-(1/2000))+51*((1/1949)-(1/2000))-2000*((1/1949)+(1/51))+3．
<gadget id="calculator">1 / 51</gadget>
<output>1/51 = around 0.019608</output>

<gadget id="calculator">1 / 2_000</gadget>
<output>1/2_000 = around 0.0005</output>

<gadget id="calculator">(1/51) - (1/2_000)</gadget>
<output>1_949/102_000 = around 0.019108</output>

<gadget id="calculator">1_949 * (1_949/102_000)</gadget>
<output>3_798_601/102_000 = around 37.241186</output>

<gadget id="calculator">1 / 1_949</gadget>
<output>1/1_949 = around 0.000513</output>

<gadget id="calculator">(1/1_949) - (1/2_000)</gadget>
<output>51/3_898_000 = around 0.000013</output>

<gadget id="calculator">51 * (51/3_898_000)</gadget>
<output>2_601/3_898_000 = around 0.000667</output>

<gadget id="calculator">(1/1_949) + (1/51)</gadget>
<output>2_000/99_399 = around 0.020121</output>

<gadget id="calculator">2_000 * (2_000/99_399)</gadget>
<output>4_000_000/99_399 = around 40.241854</output>

<gadget id="calculator">(2_601/3_898_000) - (4_000_000/99_399)</gadget>
<output>-4_104_601/102_000 = around -40.241186</output>

<gadget id="calculator">(3_798_601/102_000) + (-4_104_601/102_000) + 3</gadget>
<output>0</output>

<result>0</result>