kiem tra dai so 9 chuong I

<span class='text_page_counter'>(1)</span>PHÒNG GIÁO DỤC ĐỨC LINH TRƯỜNG : THCS Đông Hà. ĐỀ KIỂM TRA 1 TIẾT MÔN : TOÁN LỚP 9 (Tiết 17 Tuần 9 theo PPCT) Điểm :. Lời phê của Thầy ( Cô ). Họ và tên : ………………………… Lớp : 9...... I/ TRẮC NGHIỆM : ( 3 điểm ) : Khoanh tròn chữ cái đứng trước câu trả lời đúng Câu 1 : x  2 xác định khi :. A. x < – 2 Câu 2 : Tính. B. x ≥ 0. C. x ≥ –2. D . x ≤ –2. 2. 16a được kết quả là :. A. 4| a | Câu 3: Nếu 9 x – A.3. B. –4a 4 x = 3 thì x bằng 9 B. 5. Câu 4 : Nếu x < 0 thì. ( x  1). A.x–1. C . ± 4a. D . 4a. 9 C . 25. D. 9. C.1–x. D . ( x – 1)2. C.±5. D .cả A,B,C đều sai. 2. bằng B. ± (x – 1). Câu 5 : Căn bậc hai số học của 25 là. A.5. B. –5. 2 2 Câu 6 :Rút gọn 2  1 được kết quả là A.2 B. 2. C.. 2 ( 2 + 1)2. D.2 2. II/ TỰ LUẬN: ( 7 điểm ) Bài 1 ( 3 điểm ) Tính :. 72  18  2 50 ………………………………………………………………………………. a). .................................................................................................................................................................................... .................................................................................................................................................................................... ..................................................................................................................................................................................... . . b) 5 12  6  3 . 18 ………………………………………………………………………………. .................................................................................................................................................................................... .................................................................................................................................................................................... .................................................................................................................................................................................... 2 2 c) 5  2 + 5  2 ………………………………………………………………………………… ….. .................................................................................................................................................................................... .................................................................................................................................................................................... .................................................................................................................................................................................... .................................................................................................................................................................................... .....................................................................................................................................................................................

<span class='text_page_counter'>(2)</span> .................................................................................................................................................................................... 1 9 x  27  x  3  4 x  12 7 2 Bài 2. Tìm x, biết (2 điểm) : ……………………………………...... .................................................................................................................................................................................... .................................................................................................................................................................................... .................................................................................................................................................................................... .................................................................................................................................................................................... .................................................................................................................................................................................... .................................................................................................................................................................................... x 4 x 4  x x 2 Bài 3 (1,5 điểm ) : Cho biểu thức M = x  2 với x > 0 , x  4. . . a)Rút gọn biểu thức M b)Tìm x để biểu thức M > 0 . .................................................................................................................................................................................... .................................................................................................................................................................................... .................................................................................................................................................................................... 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Bài4 (0,5điểm) Tính √ 15+2 √ 35+ √ 60+ √ 84 .................................................................................................................................................................................... .................................................................................................................................................................................... .................................................................................................................................................................................... .................................................................................................................................................................................... .................................................................................................................................................................................... .................................................................................................................................................................................... .................................................................................................................................................................................... .................................................................................................................................................................................... .................................................................................................................................................................................... .................................................................................................................................................................................... .................................................................................................................................................................................... .................................................................................................................................................................................... .................................................................................................................................................................................... .................................................................................................................................................................................... .................................................................................................................................................................................... .....................................................................................................................................................................................

<span class='text_page_counter'>(3)</span> PHÒNG GIÁO DỤC ĐỨC LINH TRƯỜNG:THCS Đông Hà. HƯỚNG DẪN CHẤM KIỂM TRA 1 TIẾT MÔN: ĐẠI SỐ LỚP 9. (Tiết 18 Tuần 9 theo PPCT).. I/ TRẮC NGHIỆM: (3 điểm):Mỗi câu đúng 0,5 điểm Câu 1 C. Câu 2 A. Câu 3 D. Câu 4 C. Câu 5 A. Câu 6 B. II/ TỰ LUẬN : ( 7 điểm ). Bài 1 ( 2,5 điểm ) Tính :. 72  18  2 50. a). . . b) 5 12  6  3 . c). 2 5 2 +. 18. = 6 2  3 2  10 2. ( 0, 25 điểm ). = 13 2. ( 0,25 điểm ). = 5 36  18  = 30. 18. 2 5  42 5 4. 2 5 2. =.  5. 2.  22. ( 0, 5 điểm ). =4 5 Bài 2.. ( 0, 5 điểm ) ( 0,5 điểm ). ( 0,5 điểm ). 1 4 x  12 7 2. 9 x  27  x  3 .  3 x 3+ x 3- x 3 =7  3 x 3 =7 7 x  3  = 3 49  x–3 = 9 4  x =89. (0,5). (0,5) (0,5). Bài 3 ( 2 điểm ) : x 4 x 4. a)Rút gọn : M =. x. . x 2. . ( 0,75 điểm ). x 2. =. x. ( 0,5 điểm ). x >0 x–2>0  x>4. ( 0,25 điểm ). b) Vì x > 0 , , x  4 nên Do đó M > 0 khi Bài 4( 1 điểm ) : Điều kiện x  1. x =2 x 1  x – 1 –2 x 1 + 1 = 0  ( x  1 – 1)2 = 0 x 1 = 1 . ( 0,5 điểm ) ( 0,25 điểm ) ( 0,25 điểm ) ( 0,25 điểm ).

<span class='text_page_counter'>(4)</span>  x = 2 ( TMĐK). ( 0,25 điểm ).

<span class='text_page_counter'>(5)</span>