[KongchangAI]
Unverified80% confidenceTradeoffTime unknown

概念覆盖广度与专注度存在权衡:一套涵盖计数、加减、几何、分类的"全能包"往往每项都浅,3-5岁建议按阶段单项精练(先数感再运算),一次投放过多教具反而降低专注

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