If 2x**2-4x+2+\sqrt{x+2y-1}=0, then xy=how much.
若2x**2-4x+2+\sqrt{x+2y-1}=0，那么xy=多少．
<gadget id="calculator">1 + 0</gadget>
<output>1</output>

<gadget id="calculator">1 * 0</gadget>
<output>0</output>

<result>0</result>