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ttthaonguyen911
2 năm trước
Giúp mình với !!!! Cho vectơ a(-2x;3) và vectơ b(-3;x+1). Gọi k là góc giữ của vectơ a và vectơ b. Giá trị nguyên lớn nhất của x sao cho k là góc tù
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