简便计算:(1)(x-2y)(-x+2y) (2)(x+y-2)²
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简便计算:(1)(x-2y)(-x+2y) (2)(x+y-2)²
简便计算:(1)(x-2y)(-x+2y) (2)(x+y-2)²
简便计算:(1)(x-2y)(-x+2y) (2)(x+y-2)²
(1)(x-2y)(-x+2y)
=-(x-2y)²
=-x²-4y²+4xy;
(2)(x+y-2)²
=x²+y²+4+2xy-4x-4y;
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