(5x-2y)²-2(5x-2y)+1

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(5x-2y)²-2(5x-2y)+1
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(5x-2y)²-2(5x-2y)+1
(5x-2y)²-2(5x-2y)+1

(5x-2y)²-2(5x-2y)+1
(5x-2y)²-2(5x-2y)+1
=[(5x-2y)-1]²
=(5x-2y-1)²
提示:将5x-2y看做整体,直接运用完全平方公式