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ban danh vua thoi
Bằng
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Dựa vào BBT ta thấy hàm số có TXĐ: D = R \{-l}, hàm số nghịch biến trên từng khoảng xác định và có
TCN là y = -2.
Ta thấy các hàm số ở cả 4 đáp án đều có TXĐ: D = R \ {-l}.
Tuy nhiên chỉ có đáp án A và đáp án D là đồ thị hàm số có TCN là đường y = -2.
+) Xét đáp án A:
⇒ hàm số đồng biến trên từng khoảng xác định ⇒ loại đáp án A
Chọn D
Chọn C
Từ hình vẽ ta suy ra: tiệm cận đứng của đồ thị hàm số có phương trình x = -1, nên hàm số đã cho xác định khi và chỉ khi x ≠ -1
Trên mỗi khoảng 
đồ thị hàm số là một đường đi lên từ trái sang phải, nên hàm số đồng biến trên mỗi khoảng 
Vậy y' > 0, ∀ x ≠ - 1
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cái này ko chỉ có mỗi số 8 đâu chị ey
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