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分解因式（x+1)(x+2)(x+3)(x+6)+x² ?该怎么换元？有什么玄机？
分解因式（x+1)(x+2)(x+3)(x+6)+x² ?该怎么换元？有什么玄机？
初中数学竞赛题：因式分解题型大全36/121
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