(x+3y)^2-2(x+3y)(4x-3y)+(4x-3y)^2
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(x+3y)^2-2(x+3y)(4x-3y)+(4x-3y)^2(x+3y)^2-2(x+3y)(4x-3y)+(4x-3y)^2(x+3y)^2-2(x+3y)(4x-3y)+(4x-3y)^2(
(x+3y)^2-2(x+3y)(4x-3y)+(4x-3y)^2
(x+3y)^2-2(x+3y)(4x-3y)+(4x-3y)^2
(x+3y)^2-2(x+3y)(4x-3y)+(4x-3y)^2
(x+3y)^2-2(x+3y)(4x-3y)+(4x-3y)^2
=[(x+3y)-(4x-3y)]²
=(-3x+6y)²
=9x²-36xy+36y²
原式=(x+3y-4x+3y)²=(3x-6y)²=9(x-2y)²
满意请采纳，O(∩_∩)O谢谢~
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