Toan-De_kiem_tra_dinh_ki_so_01

# Toan-De_kiem_tra_dinh_ki_so_01 - Kha h c Ton 12 Th y L B Tr...

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Khóa học Toán 12 – Thầy Lê Bá Trần Phương ðề kiểm tra ñịnh kì số 01 Hocmai.vn – Ngôi trường chung của học trò Việt Tổng ñài tư vấn: 1900 58-58-12 - Trang | 1 - Bài 1 (6,0 ñiểm) Cho hàm số: 3 2 6 9 4 y x x x = − + + . a) Khảo sát sự biến thiên và vẽ ñồ thị ( ) C của hàm số ñã cho. b) Viết phương trình tiếp tuyến của ñồ thị ( ) C tại giao ñiểm của ( ) C với trục hoành. c) Tìm m ñể phương trình sau ñây có 3 nghiệm phân biệt: 3 2 6 9 4 0 x x x m + + = Bài 2 (2,0 ñiểm) Cho hàm số 3 2 2 2 2 2(3 1) , 3 3 y x mx m x m = + là tham số thực Tìm m ñể hàm số có hai ñiểm cực trị 1 2 à x v x sao cho 1 2 1 2 2( ) 1 x x
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