Bài kiểm tra 1 tiết môn: Đại số 8 năm học: 2016 - 2017 - Trường THCS Quang Trung

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Lớp 8 ...........
Điểm
BÀI KIỂM TRA 1 TIẾT
Môn: Đại số 8
Bài số 1 Năm học: 2016 - 2017
Lời phê:
ĐỀ 01
 I-TRẮC NGHIỆM ( 3 điểm) Khoanh tròn vào chữ cái đứng trước câu trả lời đúng:
 Câu 1: Giá trị của x2 + 2x+ 1 tại x = 9 bằng:
 A.100 B.99 C.121 D.10
 Câu 2: Cho x2 – 1 = 0 thì x bằng:
 A. 1 B. (-1) C. 1 và -1 D. Phương án khác
 Câu 3: Phân tích đa thức x2 – 9 thành nhân tử bằng:
 A. x – 3 B. x +3 C. (x+3)(x-3) D. Phương án khác
 Câu 4 : 4x3y : 2xy bằng:
 A. 2xy B. 2xy C. 2x3 D. 2x2 
 Câu 5: 5x2yn : 5x2y3 = 1 thì n bằng:
 A. n = 1 B. n = 3 C. n = 2 D. n = 0
 Câu 6 : Biểu thức 14n+1 - 14n ( Với n là số tự nhiên ) chia hết cho :
 A. 13	B.23 	C.11	D.17
 II-TỰ LUẬN: ( 7 điểm)
 Bài 1(2đ) Làm tính nhân :
 a/ x (x2 - 4x + 3) b/ (x - 3)(x + 4)
 Bài 2 (2đ) Phân tích đa thức thành nhân tử:
 a/ x2 – 2xy + x – 2y
 b/ x2 – 2x + 1 – y2
 Bài 3 : (2đ) Thực hiện phép chia:
 a/ (9x5y2 ) : ( 3xy2)
 b( 2x4 - 13 x3 +15x2 + 11x - 3) : (x2 - 4x - 3)
 Bài 4 : (0.5đ) Tìm x biết:
 x2 – 6x + 5 = 0
 Bài 5: (0.5đ) Tìm giá trị nhỏ nhất của biểu thức với mọi số thực x,y.
 F(x,y) = 10x2 + 5y2 – 4x - 6y – 12xy + 2029
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Trường THCS Quang Trung
Họ và tên....................................................
Lớp 8 ...........
Điểm
BÀI KIỂM TRA 1 TIẾT
Môn: Đại số 8
Bài số 1 Năm học: 2016 - 2017
Lời phê:
ĐỀ 02
 I-TRẮC NGHIỆM ( 3 điểm) Khoanh tròn vào chữ cái đứng trước câu trả lời đúng:
 Câu 1: Giá trị của x2 + 4x+ 4 tại x = 8 bằng:
 A.10 B.99 C.121 D.100
 Câu 2: Cho x2 + 1 = 0 thì x bằng:
 A. 1 B. (-1) C. 1 và -1 D. Không có nghiệm x.
 Câu 3: Phân tích đa thức x2 – 25 thành nhân tử bằng:
 A. x – 5 B. x +5 C. (x+5)(x-5) D. Phương án khác
 Câu 4 : 4x2y2 : 2xy bằng:
 A. 2xy B. 2xy2 C. 2x3 D. 2x2 
 Câu 5: 5x2yn : 5x2y5 = 1 thì n bằng:
 A. n = 3 B. n = 5 C. n = 2 D. n = 1
 Câu 6 : Biểu thức 18n+1 - 18n ( Với n là số tự nhiên ) chia hết cho :
 A. 21	B.8 	C.17	D.19
 II-TỰ LUẬN: ( 7 điểm)
 Bài 1(2đ) Làm tính nhân :
 a/ x (x2 - 2x + 3) b/ (x - 2)(x + 5)
 Bài 2 (2đ) Phân tích đa thức thành nhân tử:
 a/ x2 – 3xy + x – 3y
 b/ t2 – 2t + 1 – x2
 Bài 3 : (2đ) Thực hiện phép chia:
 a/ (9x4y2 ) : ( 3xy2)
 b( 2x4 - 13 x3 +15x2 + 11x - 3) : (x2 - 4x - 3)
 Bài 4 : (0.5đ) Tìm x biết:
 x2 – 9x + 8 = 0
 Bài 5: (0.5đ) Tìm giá trị nhỏ nhất của biểu thức với mọi số thực x, y.
 F(x,y) = 5x2 + 10y2 – 6x - 4y – 12xy + 2029
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