1.(x+2)(x+4)+12.(x^2-2x-2)(x^2-2x+4)+9
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1.(x+2)(x+4)+12.(x^2-2x-2)(x^2-2x+4)+9
1.(x+2)(x+4)+1
2.(x^2-2x-2)(x^2-2x+4)+9
1.(x+2)(x+4)+12.(x^2-2x-2)(x^2-2x+4)+9
设 x^2 - 2x = y
原式= (y-2)(y+4)+9
= y^2 + 2y - 8 + 9
= y^2 + 2y + 1
= (y+1)^2
= (x^2 - 2x + 1)^2
= (x-1)^4
300字读后感 2篇 俄把格式说一下吧:《xxxx》(写题目)主要内容:x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x(写那篇文章的主要内容)思考分析:x x x
1.(x+2)(x+4)+12.(x^2-2x-2)(x^2-2x+4)+9
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