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單元一 內角與外角 · 2019. 10. 17. · 2 例題一: abc 中,∠a=85°,∠b=33°,求 ∠c 的外角度數為何? 解題思維: 首先,面對幾何題時我們盡量將符合題意的圖形畫出來,接下來根據
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