((456+455*457)/(456*457-1)).
((456+455*457)/(456*457-1))．
<gadget id="calculator">455 * 457</gadget>
<output>207_935</output>

<gadget id="calculator">456 + 207_935</gadget>
<output>208_391</output>

<gadget id="calculator">456 * 457</gadget>
<output>208_392</output>

<gadget id="calculator">208_392 - 1</gadget>
<output>208_391</output>

<gadget id="calculator">208_391 / 208_391</gadget>
<output>1</output>

<result>1</result>