De kiem tra 1 tiet toan 8 chuong 1
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<span class='text_page_counter'>(1)</span>Trường THCS Quang Trung Điểm Họ và tên.................................................... Lớp 8 ........... Lời phê:. BÀI KIỂM TRA 1 TIẾT Môn: Đại số 8 Bài số 1 Năm học: 2016 - 2017. 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 2 Câu 2: Cho x – 1 = 0 thì x bằng: A. 1 B. (-1) C. 1 và -1 D. Phương án khác 2 Câu 3: Phân tích đa thức x – 9 thành nhân tử bằng: A. x – 3 B. x +3 C. (x+3)(x-3) D. Phương án khác 3 Câu 4 : 4x y : 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 n+1 n Câu 6 : Biểu thức 14 - 14 ( 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 ............................................................................................................................................................................................................................................................................. ............................................................................................................................................................................................................................................................................. ............................................................................................................................................................................................................................................................................. ............................................................................................................................................................................................................................................................................. ............................................................................................................................................................................................................................................................................. ............................................................................................................................................................................................................................................................................. ............................................................................................................................................................................................................................................................................. ............................................................................................................................................................................................................................................................................. ............................................................................................................................................................................................................................................................................. ..............................................................................................................................................................................................................................................................................
<span class='text_page_counter'>(2)</span> Trường THCS Quang Trung Điểm Họ và tên.................................................... Lớp 8 ........... Lời phê:. BÀI KIỂM TRA 1 TIẾT Môn: Đại số 8 Bài số 1 Năm học: 2016 - 2017. 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 2 Câu 2: Cho x + 1 = 0 thì x bằng: A. 1 B. (-1) C. 1 và -1 D. Không có nghiệm x. 2 Câu 3: Phân tích đa thức x – 25 thành nhân tử bằng: A. x – 5 B. x +5 C. (x+5)(x-5) D. Phương án khác 2 2 Câu 4 : 4x y : 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 n+1 n Câu 6 : Biểu thức 18 - 18 ( 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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