KT CHUONG1 DS 7

<span class='text_page_counter'>(1)</span>Họ tên: ................................................................................ Lớp: 7A1. ĐỀ KIỂM TRA CHƯƠNG I Đại số 7 (Thời gian 45 phút). Đề bài I. Phần trắc nghiệm(2,0đ). |− 35|. Câu 1: Giá trị của biểu thức 3. bằng: 3. A. – 5. 5. B. 5. C– 3. D.. 5 3. Câu 2: Cho a,b,c,d là các số khác 0. Có bao nhiêu tỉ lệ thức khác nhau được lập từ đẳng thức a.d = c.b A. 1 B. 2 C. 3 D. Một kết quả khác Câu 3: Kết quả so sánh 2300 và 3200 là A. 2300 = 3200 B. 2300 > 3200 C. 2300 < 3200 D. Không so sánh được Câu 4: Biểu diễn nào sau đây là sai ? 5. 17. A. 12 =0,4 (16) B. 11 =1,(54) II. Phần tự luận:(8,0đ) Câu 5: Thực hiện phép tính bằng cách hợp lí 15. 7. 19. 15. 7. C. 30 =0,2(3). 13. D. 25 =0 ,52. 2. a) 34 + 21 + 34 −1 17 + 3 3 1 1 b) (–2)3.( 4 –0,25) : ( 2 4 − 1 6 ) Câu 6: Tìm x, biết:. a). 1 x 4 : =6 :0,3 3 4. b) (23:4).2(x+1) = 64. Câu 7: Hưởng ứng phong trào kế hoạch nhỏ của Liên Đội, ba chi đội 7A, 7B, 7C đã thu được tổng cộng 120 kg giấy vụn. Biết rằng số giấy vụn thu được của ba chi đội lần lượt tỉ lệ với 9; 7; 8. Hãy tính số giấy vụn mỗi chi đội thu được. Câu 8. So sánh. 13. a) 38. 1. và 3 b) √ 235 và 15 Bài làm. .................................................................................................................................................................................................................................................

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B. Đáp án: I, Trắc nghiệm Câu Đáp án II, Tự luận Câu 5 (3.0đ): 15. 7. 1 B 19. 15. 2 D 2. 15 19. 3 C 7. 2. 4 A 15. a) 34 + 21 + 34 −1 17 + 3 = ( 34 + 34 ) + ( 21 + 3 ) – 1 17.

<span class='text_page_counter'>(3)</span> =. 1. +. 1. 15. –1 17. 2. = 17. 3 1 1 9 b) (–2)3.( 4 –0,25) : ( 2 4 − 1 6 ) = –3 13 Câu 6 (2 đ). (1,5 đ) (1,5 đ). 1 x 13 ⇔ x= a) 4 3 : 4 =6 :0,3 b) x = 4 15 Câu 7 (2 đ) Gọi số giấy vụn 7A, 7B, 7C thu được lần lượt là a, b, c kg. a. b. c. a. b. c. a+b+ c 120. Ta có: 9 = 7 = 8 và a + b + c = 120 suy ra 9 = 7 = 8 = 9+8+7 = 24 Vậy a = 5.9 = 45 (kg) b = 5.7 = 35 (kg) c = 5.8 = 40 (kg) (1 đ) Câu 8. (1,0đ) 13. a) 38. 13. 1. > 39 = 3. b) 15= √ 225 < √ 235. = 5 (1đ).

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