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三角形外角和=360⁰

Author:李春培

三角形外角和=360⁰

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【案例】2018年全国1卷理科12题
【案例】圆柱体内放置一个大球六个小球
三位數除以一位數（二）
兩組對邊相等和有直角的四邊形
找出對稱軸

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