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phucnhi
2 năm trước
Cho đoạn thẳng AB. Vẽ cung tròn tâm A bán kính AB và cung tròn tâm B bán kính BA, chúng cắt nhau ở C và D. Chứng minh rằng: a) ∆ ABC = ∆ABD b) ∆ ACD = ∆ BCD
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