Không phải $n$ mà là $x$.
• $\lim\limits_{x\to 0^+}\dfrac{1}{x}=+\infty$ vì:
$\lim\limits_{x\to 0^+}1=1$
$\lim\limits_{x\to 0^+}x=0$
$x\to 0^+\Rightarrow x>0$ (mẫu dương)
$\Rightarrow$ áp dụng quy tắc tìm giới hạn vô cực
• $\lim\limits_{x\to 0^-}\dfrac{1}{x}=-\infty$ tương tự nhưng mẫu âm vì $x\to 0^-\Rightarrow x<0$
$lim_{n \to 0^+} \dfrac{1}{x}$
vì $n \to 0^+$ =>$x>0$
mà $1>0$
=> thương của 2 số dương là số dương
=>$lim_{n \to 0^+} \dfrac{1}{x}=+\infty$
lại có $lim_{n \to 0^-} \dfrac{1}{x}$
vì $n \to 0^-$ => $x<0$
mà 1 >0
=> thương của 2 số khác dấu là số âm
=>$lim_{n \to 0^-} \dfrac{1}{x}=-\infty$
xin hay nhất
Cho phương trình x^2 - 2(m - 1) - 4m - 4 = 0 a) Chứng minh rằng phương trình luôn có hai nghiệm phân biệt x1, x2 với mọi giá trị của m. b) Tìm m để |x1 - x2| đạt giá trị nhỏ nhất. Mn làm câu b thôi nha. Mình cảm ơn !
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giúp e vs ạ thanks nhiều ạ giải chi tiết nha
Cho đoạn thẳng AB dài 12 cm, lấy điểm C nằm giữa A và B sao cho BC = 6 cm. a) Tính độ dài đoạn thẳng AC b) Điểm C có là trung điểm của đoạn thẳng AB không? Vì sao? c) Lấy điểm M nằm giữa A và B ( điểm M khác điểm C ). Gọi E và F lần lượt là trung điểm của AM và BM. Tính độ dài đoạn thẳng EF
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Làm cẩn thận + giải thích dễ hiểu giúp mik nhé 11. A: You’re just missed the last train! B: Never mind, I_______. A. will walkB. will be walkingC. walk D. will have walked 12. Whenever she came to see me, she _____ something to my children. A. would give B. had given C. will have given D. was giving 13. The chairs _______ from the ballroom before the dance begins. A. will have been removed B. will have removed C. will remove D. were removed 14. Clare _______five years old next month. A. is going to be B. will be C. will have been D. is 15. If he's late again, I_____ very angry. A. am going to be B. will be C. would be D. am 16. I ______ an exam next October. A. am taking B. have taken C. take D. will be taken 17. “Can I come by for my check tomorrow?” “ Yes, by then I _______ time to go to the bank” A. will have had B. will have C. have had D. have 18. There is going to be a bus strike. Everyone______ to work A. will walk B. will be walkingC. will have walk D. shall walk 19. A: “The phone is ringing” B. “ I ______it”. A. answer B. will answer C. have answered D. will be answering 20. We should learn how to choose our words carefully or they ______ our speech silly and vulgar. A. made B. will make C. would make D. have made
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