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腾讯动漫
Author:
黑幽灵
腾讯动漫
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兩位數加法
兩組對邊相等和有直角的四邊形
四邊形的特性
判斷球體
球體建築師
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正六面體
proof 64 潘研
angle sum of triangle
Ex10.1 q13
拋物線2--焦點法
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Logic
Means
Hypergeometric Distribution
Rotation
Linear Programming or Linear Optimization