(×-2y)²+(x+2y)(x-2y)-2x(2x-y)
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(×-2y)²+(x+2y)(x-2y)-2x(2x-y)
(×-2y)²+(x+2y)(x-2y)-2x(2x-y)
(×-2y)²+(x+2y)(x-2y)-2x(2x-y)
(×-2y)²+(x+2y)(x-2y)-2x(2x-y)
(×-2y)²+(x+2y)(x-2y)-2x(2x-y)
(×-2y)²+(x+2y)(x-2y)-2x(2x-y)