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江苏竞赛题：如何分解因式(1+y)² -2x² (1+y² )+x ⁴(1-y)²
江苏竞赛题：如何分解因式(1+y)² -2x² (1+y² )+x ⁴(1-y)² ？先配方，再用平方差公式，最后提公因式
初中数学竞赛题：因式分解题型大全49/121
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