[ Mức 1] Tiệm Cận Ngang Của đồ Thị Hàm Số Y=−x−2x+1 Là

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[ Mức 1] Tiệm cận ngang của đồ thị hàm số y=−x−2x+1 là A.y=−2 . B.y=−1 . C.x=−1 . D.x=2 . Đáp án và lời giải Đáp án:B Lời giải:Lời giải Chọn B Tập xác định: D=ℝ\−1 . Ta có limx→±∞fx=limx→±∞−x−2x+1=limx→±∞−x1−2xx1+1x=limx→±∞−1−2x1+1x=−(1−0)1+0=−1 . Suy ra đồ thị hàm số có tiệm cận ngang y=−1 .

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  43 263 : 9

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