ĐỀ-ĐÁP ÁN KIỂM TRA C IV ĐẠI SỐ 8

... thu c Z nên : x = { 1 , 2 , 3 , … , n } n thu c N . (1đ) C u 2 : ( 3 điểm ) a, Giải BPT ta c tập nghiệm : x < - (1 điểm ) Biểu diễn trên tr c số đúng cho : 0,5đ điểm . b, Giải BPT ta c ... : x > 1 ho c x < -7 .(1đ) Biểu diễn trên tr c số đúng cho : 0,5đ điểm C u 3 : ( 2 điểm ) . a . Giải phương trình ta c nghiệm : x = - ( 1điểm ) b . Giải phương trình c nghiệm : x ... với mọi x. ( hay luôn dương với mọi x ) . ( 1 điểm ). C u 5 : ( 1 điểm ) . ( c nhiều c ch giải ) C1 , Từ gt ta c : a + b = 1 => a = 1 – b => a2 +b2 = ( 1 –b)2 +b2 = 1- 2b...

... Bài 4*: Cho a, b ,c lµ c c sè kh«ng ©m chøng minh r»ng : (a + b)(b + c) (c + a) ≥ 8abcBÀI LÀMI/ PHẦN TR C NGHIỆM : C u 1) HS điền đúng mỗi c u đư c 0,5 điểma) …………………… c hai vế c a ………………………… ... :………………………………………………………………………………………………………………………………………………………………………………………………………………………………ĐỀ SỐ 02I/ PHẦN TR C NGHIỆM : C u 1) Hãy điền vào chỗ trống (…) những c m từ thích hợp để đư c nội dung đúng.a) Khi nhân c a bất đẳng th c với c ng một số dương ta đư c một bất đẳng th c mới ... ………………………… c ng chiều …………………b) …………………… c hai vế ………………………… c ng chiều ……………… C u 2) HS khoanh tròn đúng mỗi c u đư c 0,5 điểm1/ A 2/ B 3/ A 4/ C 5/ D 6/ A C u 3) HS nỗi đúng mỗi c u đư c 0,5đ C t...

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... 09 Ngy kim tra: / 04 / 09Tit 65. KIM TRA CHNG IV MễN I S 8 A. MC TIấU- Kiến th c: Kiểm tra vi c nắm kiến th c cơ bản c a h c sinh sau khi h c xong chơng" Bất phơng trình b c nhất một ... + C u 2. Nhân c hai vế c a một bất đẳng th c với c ng 1 số dơng ta đ c một bất đẳng th c: A. Bằng với bất đẳng th c đà cho B. Ng c chiều với bất đẳng th c đà cho C. Lớn hơn bất đẳng th c đà cho ... bất đẳng th c đà cho B. Lớn hơn bất đẳng th c đà cho C. C ng chiều với bất đẳng th c đà cho D. Một bất đẳng th c bằng với bất đẳng th c đà cho C u3 . Nhân c hai vế c a bất đẳng th c a < -b...

... Giáo án đại số lớp 8 8. Khi x > 0 thì kết quả rút gọn c a biểu th c | 5x| -3 2x làA. 3x 3 B. 7x - 3 C. - 3x 3 D. -7x - 3 Phần tự luận:(6 điểm)1. (1 điểm) Viết tập nghiệm c a BPT sau ... diễn tập nghiệm đó trên tr c số 3x + 1 > 52.(1.5 điểm) a, Cho - 3a > -3b hÃy so sánh a với b b, Cho a > b hÃy so sánh 2a +3 với 2b + 13.(2điểm) Giải c c BPTa. 3x(2x - 31) > ... điểm) Cho B = | 3x 2| - x 2a. Bỏ dấu giá trị tuyệt đối và rút gọn B khi: + x 32 + x < 32b. Giải PT: | 3x 2| - x 2 = 0Giáo viên: Lê Thị Tuyết Tr ờng PTDT Nội Trú Ng c L c ...

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... và tên: .Lớp 8 Trờng THCS TT Bằng Lũng Ngày kiểm tra: / 4/ 2009 KIểM TRA 45 Điểm Lời phê c a Thầy, C giáo Môn: Đại số 8 Bài số 4 - Đề số I Đề bài I/ Phần tr c nghiệm khách quan ( 2điểm ... > 8n - 2Bài làmHọ và tên: .Lớp 8 Trờng THCS TT Bằng Lũng Ngày kiểm tra: / 4/ 2009 KIểM TRA 45 Điểm Lời phê c a Thầy, C giáo Môn: Đại số 8 Bài số 4 - Đề số II Đề bài I/ Phần tr c nghiệm ... ( 8 điểm ) C u 4: Giải c c bất fơng trình sau và biểu diễn tập nghiệm c a chúng trên tr c số a) x + 3 > 4b) -4x + 8 0 C u 5: Giải fơng trình: = 2x + 12 C u 6: Cho m > n. Chứng minh: 8m...

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