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如何分解因式（x+1)⁴+(x² -1)² +(x-1)⁴?先配方，再平方差公式
日本数学竞赛题：如何分解因式（x+1)⁴+(x² -1)² +(x-1)⁴?先配方，再平方差公式
初中数学竞赛题：因式分解题型大全41/121
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