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npthanh2408
2 năm trước
Cho ΔABC cân: a) Biết ∠A = 40 độ. Tính ∠B, ∠C b) Biết ∠B = 100 độ. Tính ∠A, ∠C c) Biết ∠A = 2∠B. Tính 3 góc d) Biết ∠B = 2 ∠A = ∠C. Tính 3 góc
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