`1/(2sqrt(x)-2) + 1/(2sqrt(x)+2) + x/(1-x) \ \ (ĐK : x>=0 ; x ne 1)`
`= 1/(2(sqrt(x)-1)) + 1/(2(sqrt(x)+1)) - x/(x+1)`
`= (sqrt(x)+1+sqrt(x)-1-2x)/(2(sqrt(x)-1)(sqrt(x)+1))`
`= (2sqrt(x)-2x)/(2(x-1))=(2(sqrt(x)-x))/(2(x-1))`
`= (sqrt(x)-x)/(x-1)`
.
Vẽ anime/chibi :v Không chép^^^
Mn vẽ cho tui .... cái gì liên quan đến tim nhá ( Vd : thả tim...bắn tim...búng tim....:333) oi sướng vãi....:333
Giúp mình nhé ..............................................
Cho tam giác ABC vuông tại A có AB = 6cm , AC = 8cm .Từ B kẻ đường thẳng a // AC ; phân giác góc BAC cắt BC tại M và cắt đường thẳng a tại N . a) CM : ΔBMN đồng dạng ΔCMA b) CM : AB/AC = MN/AM c) Từ N kẻ NE vuông góc với AC ( E ∈ AC), NE cắt BC tại I .Tính BI.
giúp mình vs nhé !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
cứu với sắp trả bài r! a,x mũ 2 = x mũ 5 b, 5 mũ x + 5 mũ x + 2 = 650 c, 32 mũ x .16 mũ x = 1024
Xác định hàm số bậc nhất y = ax+b biết rằng đồ thị của hàm số đi qua điểm ( 2;-3 ) đồng thời song song với đồ thị hàm số y = 3x+1
giúp mình với ạ:(((mình đng cần gấp
Giải hệ phương trình: $\left \{ {{x + 2y - xy - 2 = 0} \atop {x^{2} - y^{2} + 2x^{2}y + 2xy^{2} + 1 = 0}} \right.$
Exercise 3: Choose the best answer that best fits the meaning of the sentence or is the passage sentences of the root one. 14. The fire has caused a considerable damage. A. A considerable damage been has caused the fire. B. A considerable damage has caused the fire. C. A considerable damage has been caused by the fire. D. A considerable damage has caused by the fire. 15. John will have received the papers by tomorrow. A. The papers will have been received by tomorrow by John. B. The papers will have received John by tomorrow. C. The papers will have been received John by tomorrow. D. The papers will have received tomorrow by John. 16. They haven’t decided anything yet. A. Nothing has been decided yet. B. Anything haven’t been decided yet. C. Nothing has decided yet. D. Anything have decided yet. 17. Your hair is long. You ought to get it cut. A. Your long hair needs cutting. B. You ought to have your long hair cut. C. Your long hair should be cut. D. All are correct. 18. The medical profession borrowed the technology from the other fields. A. The technology borrowed the medical profession from the other fields. B. The technology was borrowed from the other fields by the medical profession. C. The technology were borrowed from the other fields the medical profession. D. The technology from the other fields borrowed by the medical profession. 19. The surgeons arranged for the installation of a TV screen in the operating theatre. A. The installation of a TV screen in the operating theatre arranged the surgeons. B. The installation of a TV screen in the operating theatre arranged by the surgeons. C. The installation of a TV screen in the operating theatre were arranged by the surgeons. D. The installation of a TV screen in the operating theatre was arranged by the surgeons. 20. They first drew up emergency plans, later abandoned to build new cities. A. Emergency plans was first drown up and later abandoned to build new cities. B. Emergency plans were first drown up and later abandoned to build new cities. C. Emergency plans are first drown up and later abandoned to build new cities. D. Emergency plans is first drown up and later abandoned to build new cities.
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