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"已知关于x的方程x的平方＋kx＋k＋2等于0的两个根是x1，x2，且x1的平方＋x2的平方＝4，求k的值"

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Bundle Babies Baby Doll Collection Sherry Rawn "Bundle Babies" Miniature Lifelike Baby Dolls
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$29.99 US
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Holiday Jingle Bell Ornament Set 6-Piece Miniature Babies In Stockings Ornament Set
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$99.99 US
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