Your car has a white colour, A. Hasn't it B. Doesn't it C. Has it D. Does it 2, , he will have a party with friends A. Once he gets his first job B. When he got his first job C. As he got his first job D. After he had got his first job 3, Two renowned researchers at Oxford University this scientific theory A. Upgraded B. Enlarged C. Magnified D. Advanced 4, Name was too tired, so he went to sleep lunchtime A. For B. On C. With D. At 5, a Master's at Cambridge University, he returned to his country and established his own company A. Has done B. Having done C. Have been done D. Having been doing 6, Last Saturday, Susan some old friends and they had a long conversation with each other A. Cut down B. Put off C. Came across D. Brought off

cho (C) y=x^3+3x^2+mx-1 và d y= x+m+2 tìm m để d cắt (C) tại 3 điểm phân biệt ABC sao cho BC=4 , biết xA=1

, Cho hàm số y=x-1/x^2+mx+4. Tìm m để đồ thị hàm số có 2 đường tiện cận 13, tìm m để(C):y= mx^3-x^2-2x+8m cắt Ox tại 3 điểm phân biệt có Hoành độ âm 14,cho (C) :y= x^3+(m+2) x+1 d:y= 2x-1 Tìm m để d cắt C tại 1 điểm duy nhất có Hoành độ dương 15, tìm m để phương trình -x^4+2x^2+3x+2m=0 có 3 nghiệm phân biệt