(x+2y)^2-2(x+2y)+1怎么分解因式?,
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(x+2y)^2-2(x+2y)+1怎么分解因式?,
(x+2y)^2-2(x+2y)+1怎么分解因式?,
(x+2y)^2-2(x+2y)+1怎么分解因式?,
(x+2y)^2-2(x+2y)+1
=(x+2y-1)^2
=(x+2y-1)^2
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