kiểm tra chương 2 đại số 9 có ma trận

kiem tra Chuong 3 Dai so 9 (co ma tran)

... đây có thể kết hợp với (1) để đợc một hệ phơng trình bậc nhất có hai ẩn có vô số nghiÖm ?A. 2x – 2 = - 2y ; B. 2x – 2 = 2y ; C. 2y = 3 2x ; D. y = 1 + x.Câu 4 (1điểm ) Cho hệ phơng trình 2 ... trong 10 ngày thì xong nên ta có phơng trình1 1 110x y+ = ( 1) 1 ®iÓm I/ Mục tiêu - HS đợc kiểm tra kiến thức về chơng hệ phơng trình bậc nhất 2 ẩn. - Kiểm tra kỹ năng vận dụng qui tắc ... hệ phơng trình,khi nào thì hệ phơng trình có nghiệm duy nhất, có vô số nghiệm, vô nghiệm. - HS có thái độ làm bài nghiêm túc, sáng tạo. II/ Ma trận đề CHủ ĐềNHậN BIếT THÔNG HIểU Vận dụngTrắc...

3
1,477
17

KIEM TRA CHUONG I DAI SO 9 có ma trận

Danh mục: Toán học

... a ≤0. Tính 2 121 16 22 5 81a+. Kết quả là: A.11 4 25 9 a+ ; B.11 4 25 9 a−; C.10 4 21 9 a+ ; D. Một kết quả khác Câu 5: Tính :5 12 2 75 5 48+ − bằng A.3 ; B. 2 3 ; C.3− ... )Bài 1(1 điểm) Giải phương trình: 2 (2 3) 5x + =Bài 2: (2 điểm)Tình A = 6 4 2 6 4 2 2 6 4 2 2 6 4 2 + −++ + − −Bài 3: (3 điểm) Cho biểu thức: A = 1 2 4 2 2xxx x− −−+ −a) Tìm điều kiện ... Chuẩn bị đề bài; HS: Chuẩn bị giấy làm bài kiểm tra, nhápIII. Kiểm tra: Kiểm tra một tiếtIV. Tiến trình bài giảng: Phát đề cho HS rồi HS làm bài. MA TRẬN ĐỀ :Chủ đề cơ bản Nhận biết Thông hiểu...

Giáo án Đề kiểm tra chương I đại số 9 - có ma trận

Danh mục: Toán học

... 2( 1 điểm)a) B.) 32( 0,5 điểmb) C. 9 0,5 điểmBài 3 (2 điểm)- Điền vào chỗ ( ) Mỗi ý điến đúng cho 0,5 điểm) 324 32 2+)+= 2 13 32 13 32 +=1=Bài 4 (2 điểm) ( )5 32 2=+x 5 32 =+x ... ( ) 2 23 có giá trị là ( ) 23 .A ( ) 32. B 1.Cb) Nếu 3 49 =xx thì x bằng 3.A 5 9 .B 9. CBài 3:( 2 iểm) Điền vào chỗ ( ) để đợc khẳng định đúng.) 324 32 2+)+= 2 3 ... căn thức1 0,51 11 0.53 2 Hằng đẳng thức 2 A = A, 2 14 2 6 3Biến đổi đơn giản các CTBH1 0,51 2 2 2, 5Rút gọn CTBH 1 2, 51 2, 55 35 4 2 3 12 10D: Đề bàiBài 1(1 đ) Khoanh...

3
1,067
7

Kiểm tra Chương IV Đại Số 9, có ma trận, phân loại đối tượng hs

Danh mục: Toán học

5
1,771
26

Kiểm tra chương 4 đại số 9 co ma trận

Danh mục: Toán học

dề kiểm tra chương 4 - dại số 8 có ma trận

Danh mục: Toán học

...

2
2,078
53

De Kiem Tra Chuong IV Dai So 8 Co Ma Tran

Danh mục: Toán học

... THCS TT Bằng Lũng Ngày kiểm tra: / 4/ 20 09 KIểM TRA 45 Điểm Lời phê của Thầy, Cô giáo Môn: Đại số 8 Bài số 4 - Đề số I Đề bài I/ Phần trắc nghiệm khách quan ( 2 iểm ) Em hÃy khoanh tròn ... điểmcho 0 ,25 điểmKhi x < 0 . Ta có -4x = 2x + 12 ⇔ -4x - 2x = 12 ⇔ -6x = 12 ⇔ x = -2 < 0 thoả mÃnVậy fơng trình đÃ cho cã 2 nghiÖm: S = { -2 ; 6}cho 0,5 điểmcho 0,5 điểmcho 0 ,25 điểmcho ... -8 x x 2 cho 0,5 điểmcho 0,5 điểmcho 0,5 điểmcho 0,5 điểmcho 0,5 điểmCâu 5( 3 điểm ): Giải fơng trình = 2x + 12 Khi x ≥ 0 . Ta cã 4x = 2x + 12 ⇔ 4x - 2x = 12 ⇔ 2x = 12 ⇔ x = 6 >...

4
1,036
9

kiem tra chuong IV dai so 8 co ma tran

Danh mục: Toán học

... 4.7?(3 7 337 2 x x− +− ≤ 2 3 L  3⇔ − − ≤ +x x 2 2 L  ⇔ − − ≤ +x x 2   2 L⇔ − ≤ + +x x 32 ⇔ − ≤x⇔ 32 −x4.E?_>=()* +,% 32 −x ... [*I\]"#G' ^4?6"# 3 7 2  ? L E F[* 1 5 8 6 8 8\\Q%#L53 2 7 2 ?− >x7 ? 2x⇔ > +7 Fx⇔ >⇔x >4.E?_>=()* ... %&'()*+,+-+,+".$/0+1 2 $/0+13$/0+10 2 4$510678& 9  $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$...

KT 45 p chuong 2 dai so 9 co ma tran

Danh mục: Toán học

Kiem tra chuong 4 Daï so 8 co ma tran

Danh mục: Toán học

de kiem tr chuong III - DAI so 9 ( co ma tran)

Danh mục: Toán học

Kiểm tra chương 4 Đại số 9( Đề+Ma Trận+Đáp án) Theo đổi mới

Danh mục: Toán học

Đề kiểm tra 45 phút chương IV Đại số 9(có Ma trận)

Danh mục: Toán học

... 0 ,25 ñb) 2 x 2 - 6 = 0 2 2 6 (0 ,25 d) x= 3 (0 ,25 d) x⇔ =⇔ ±c ) 4x 2 –4x +1 = 0 2 24 ( 4) 4.4 0 (0 ,25 d)b ac= − = − − =V Giải ra x = 1 2 (0,5 đ) d ) 6 x 2 + x – 1 =0 2 24 1 +4.6.1 =25 ... hàm số đồng biến ,x>0 hàm số nghịch biến: 0 ,25 đ -Khi x = 0 thì hàm số đạt giá trị lớn nhất 0 ,25 đBài 2 ( 2, 5 điểm ) a) 2x 2 - 5x = 0 ⇔ (2 5) 0 0 ,25 dx x − = Giaûi ra x =0 ,x= 2, 5 0 ,25 ñb) ... lập PT.1 0,3đ 2 0,6đ1 2 2 0,6 đ 2 3đ 8 6,5đĐịnh lý Vi-Ét 1 0,3đ 1 0,3đ 2 0,6đ Tổng điểm 3 0 ,9 4 1 ,2 2 4đ3 0 ,9 2 3đ 14 câu 10 diểmI V -Đề kiểm tra: I- Trắc nghiệm...

4
12,438
162

Đề kiểm tra chuong 2 đại số 9

Danh mục: Toán học

...

Kiểm tra chương 2-đại số 9

Danh mục: Toán học

... ≠0). (0 ,25 ñ)Vì A (2; 2) ∈ (d) neân : 2 a + b = 2 ⇒ b = 2 -2 a (1) (0 ,25 ñ)Vì B( -2; 3) ∈ (d) neân : -2a + b = 3 ⇒ b = 2a + 3 (2) (0 ,25 đ)Từ (1) và (2) suy ra: a = 14−Vậy hệ số góc ... và B có dạng : y = ax + b ( a ≠0). (0 ,25 ñ)Vì A(1; 2) ∈ (d) neân : a + b = 2 ⇒ b = 2 - a (1) (0 ,25 ñ)Vì B( -2; 3) ∈ (d) neân : -2a + b = 3 ⇒ b = 2a + 3 (2) (0 ,25 đ)Từ (1) và (2) suy ... laøm:…………………………………………………………………………………………………………………………………………………………………………………………………………….…………………………………………………………………………………………………………………………………………………………………………………………………………….…………………………………………………………………………………………………………………………………………………………………………………………………………….…………………………………………………………………………………………………………………………………………………………………………………………………………….…………………………………………………………………………………………………………………………………………………………………………………………………………….…………………………………………………………………………………………………………………………………………………………………………………………………………….……………………………………………………………………………………………………………………………………………………………………………………………………………. KIỂM TRA CHƯƠNG II – ĐẠI SỐ 9 I. Mục tiêu:- Kiểm tra hs kiến thức về hàm số bậc nhất: định nghóa, tính chất, đồ thị; đường thẳng song song, cắt nhau.- Kiểm tra kỹ năng vận...

ĐỀ KIỂM TRA CHƯƠNG IV - ĐẠI SỐ 9 - CÓ ĐÁP ÁN

Danh mục: Toán học

... Hay 13 12m 0 m 13 12 c) (1.0đ): Theo định lí viét ta có : 1 2 1 2 3; 2x x x x+ = = ( ) 2 2 2 1 2 1 2 1 2 2 9 4 5x x x x x x+ = + = =Đề 2: Câu 1(3.0đ): a) (1.5đ): 2 45 46 0x ... có phơng trình 2 3 2 0x x + = Ta cã : a+b+c = 1 + (- 3) + 2 = 0 Phơng trình có hai nghiệm : 1 2 1; 2x x= = b) (1.5đ) : = 9 12m + 4 = 13 12m Để phơng trình (1) có 2 nghiệm phân biệt ... Phơng trình có hai nghiệm 11x= ; 2 46x = b) (1.5đ): 2 5 6 0x x+ + = Theo định lí viét ta có : 1 2 1 2 5; 6x x x x+ = = Vậy phơng trình có hai nghiệm : 1 2 2; 3x x= = Câu 2 ( 3.0đ...