解:
〔(x-2y)^2+(x-2y)(x+2y)-2x(2x-y)〕/2x
=〔x^2-4xy+4y^2+x^2-4y^2-4x^2+2xy〕/2x
=〔-2xy-2x^2〕/2x
=-y-x=-(x+y)
〔（x-2y)的平方+（x-2y)(x+2y)-2x(2x-y)〕除以2x
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