999(4/5)+(994/5)+(94/5)+3*(1/5).
999(4/5)+(994/5)+(94/5)+3*(1/5)．
<gadget id="calculator">1_000 + 199 + 99</gadget>
<output>1_298</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1_298 - (3/5)</gadget>
<output>6_487/5 = around 1_297.4</output>

<gadget id="calculator">(6_487/5) + (3/5)</gadget>
<output>1_298</output>

<result>1_298</result>