A=x^100-8^97 Tìm nghiệm cho mik nha

Rút gọn biểu thức a)(2x-1)(2x+1)(4x^2+1) b)(2x^2+2x+1)(2x^2-2x+1)-(2x^2+1)^2

Cho tam giác ABC có trực tâm H. CMR: `tan A.\vec{HA}+tan B.\vec{HB}+tan C.\vec{HC}=\vec{0}`

D(x) = (x − 2)x 2 − 9(x − 2). ai làm cho e câu này ạ e xin cảm ơn

Lập bảng Axit.(gốc axit,axit,tên axit) tên:-Cl,-Br,-L,=S,-HCO3,=CO3,-NO3,-NO2,-HSO4,=SO4,-H2PO4,=HPO4,///PO4,-OH,-AIO2,=Zn02=,SO3

Cho M là 1 điểm bất kỳ ở miền trong tam giác ABC CMR: `S_{MBC}\vec{MA}+S_{MAC}\vec{MB}+S_{MAB}\vec{MC}=\vec{0}`

Giúp với ạ. Cần siêu gắp lắm lun ý. Cảm ơn rất nhiều

Mấy bạn mà kh làm để cho mai mình nộp là mình dận dận dận

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5. Although Nam is not an intelligent student, he can learn very fast. -> In spite of ___________________________________________________________ 6. Although it was raining heavily, we still went toschool. -> Despite______________________________________________________________ 7. Although he has a physical handicap, he has become a successful businessman. -> Despite______________________________________________________________ 8.Because of the cheap price, my wife insists on buying the Tivi. -> Because ____________________________________________________________ 9. Although he felt tired, he stayed up to keep us company. -> In spite of____________________________________________________________ 10.Because I studied hard, I passed the exam. -> Because of __________________________________________________________ 11. They didn’t play well, but they won the game. -> Although____________________________________________________________ 12. Despite the very bad traffic, we arrived on time. -> Although ___________________________________________________________ 13.Since he was careless, Tom lost the game. -> Because of___________________________________________________________ 14.Because there was an accident, I was late. -> Because of __________________________________________________________ 15.She failed the University entrance exam because her grades were bad. -> Because of ____________