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Unverified80% confidenceSolutionTime unknown

数学启蒙路径:认数(数字卡/彩虹熊 2-3岁)→ 数量对应(串珠/计数棒 3-4岁)→ 加减运算(天平秤/算珠 4-5岁)→ 抽象过渡(数字磁贴/桌游 5岁+),按阶段递进选购而非一次买全

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