[(x-2y)²+(x-2y)(x+2y)-2x(2x-y)]÷(-2x)
=[(x-2y)（x-2y+x+2y)-2x(2x-y)]÷(-2x)
=2x（x-2y-2x+y)÷(2x)
=(-x-y)
[(X-2Y)²+（x-2y）(x+2y)-2x(2x-y)]/2X
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