Trong các mệnh đề sau, mệnh đề nào đúng?
A. limx→−∞√x4−x1−2x=0limx→−∞√x4−x1−2x=0
B. limx→−∞√x4−x1−2x=+∞limx→−∞√x4−x1−2x=+∞
C. limx→−∞√x4−x1−2x=1limx→−∞√x4−x1−2x=1limx→−∞√x4−x1−2x=limx→−∞√x4−x1−2x=limx→−∞√x4−x1−2x=lim�→−∞�4−�1−2�=1
limx→−∞√x4−x1−2x=limx→−∞√x4−x1−2x=limx→−∞√x4−x1−2x=lim�→−∞�4−�1−2�=1