Performance · US
Est. downloads / month · US
<5K
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Est. revenue / month · US
<$5K
Below chart threshold
Rating · US
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Chart position
Apple's Top Grossing chart — all apps ranked by revenue (purchases + subscriptions).
Ratings count — US
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Listing
让椭圆、抛物线、双曲线「动」起来——从参数方程到生活应用，一图看懂圆锥曲线。 学圆锥曲线，最难的不是背公式，而是把方程和图形真正对应起来。
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