(x-2y)*(x-2y)-4x+8y+4= 因式分解
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(x-2y)*(x-2y)-4x+8y+4= 因式分解
(x-2y)*(x-2y)-4x+8y+4= 因式分解
(x-2y)*(x-2y)-4x+8y+4= 因式分解
(x-2y)*(x-2y)-4x+8y+4
=(x-2y)²-4(x-2y)+4
=(x-2y-2)²(把x-2y看成一个整体再用完全平方公式)
(x-2y)*(x-2y)-4x+8y+4
=(x-2y)²-4(x-2y)+4
=(x-2y-2)²
(x-2y)*(x-2y)-4x+8y+4=(x-2y-2)*(x-2y-2)
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