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hienthanhnguyen1624
2 năm trước
Câu 1. Cho tam giác ABC cân tại A, góc A = 120, Góc B = ? A .30 B. 20 C.10 D. 50 Câu 2. kết quả thu gọn của : -3/4x^3y^2 . 1/2 x^2y^3 Câu 3 Chứng minh f (x) = -x^2 - 4 vô nghiệm
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