Kiểm tra đại số 8 - Chương IV thời gian : 45 phút

Họ và tên :KIỂM TRA ĐẠI SỐ 8 - CHƯƠNG IV
Lớp 8A Thời gian : 45 phút
 Đề 1 :
 ( Học sinh làm bài vào tờ giấy này )
 I . Trắc nghiệm : ( 3đ ) ( Khoanh tròn chữ cái trước câu mà em chọn )
Câu 1 : Cho a < b , bất đẳng thức nào sau đây đúng :
 A/ – 5a > – 5b B/ C/ 2a + 3 > 2b + 3 D/ - a + 3 < - b + 3
Câu 2 : Với a , b , c mà a < b và c < 0 thì : 
 A/ ac bc 
Câu 3 : Tập nghiệm của bất phương trình 2x + 10 > 0 là :
 A/ {x | x 5}	 D. {x | x > - 5}
Câu 4 : Các số nghiệm đúng bất phương trình 3x > 9 là :
 A/ 4 ; 7	 B/ 1 ; 5	 C/ 3 ; 4	D/ 3 ; - 3
Câu 5 : Cho a - 21 < - 29 thì ta chứng tỏ được :
 A/ a - 8	 D/ a > 50
Câu 6 : Tập nghiệm của bất phương trình - 2x + 10 0 là :
 A/ {x | x 5}	 B/ {x | x - 5}	 C/ {x | x 5}	 D/ {x | x - 5}
 II . Tự luận :
Bài 1: Giải các bất phương trình sau và biểu diễn tập nghiệm của mỗi bất phương trình 
 sau lên trục số : 
 a/ 2x + 7 - 3 ( 1đ ) b/ -3x + 2 > - 8 + x ( 1đ )
 c / (x + 3)2 5 + x2 ( 1đ ) d/ ( 1đ ) 
Bài 2 : Cho a -2b + 5 ( 1đ )
Bài 3 : Giải các phương trình sau : 
 a/ = 2x - 1 ( 1đ ) b / ( 1đ ) 
BÀI LÀM
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Họ và tên :KIỂM TRA ĐẠI SỐ 8 - CHƯƠNG IV
Lớp 8A Thời gian : 45 phút
 Đề 2 :
 ( Học sinh làm bài vào tờ giấy này )
 I . Trắc nghiệm : ( 3đ ) ( Khoanh tròn chữ cái trước câu mà em chọn )
Câu 1 : Cho a < b , bất đẳng thức nào sau đây đúng :
 A/ a – 5 > b – 5 B/ C/ 2a + 3 < 2b + 3 D/ - a + 3 < - b + 3
Câu 2 : Với a , b , c mà a < b và c < 0 thì : 
 A/ ac bc D/ ac bc
Câu 3 : Tập nghiệm của bất phương trình - 2x + 10 > 0 là :
 A/ {x | x 5}	 D. {x | x > - 5}
Câu 4 : Các số nghiệm đúng bất phương trình 3x > 9 là :
 A/ 3 ; 7	 B/ 7 ; 5	 C/ 3 ; - 4	D/ 3 ; - 3
Câu 5 : Cho a + 21 < - 29 thì ta chứng tỏ được :
 A/ a - 8	 D/ a > 50
Câu 6 : Tập nghiệm của bất phương trình - 2x - 10 0 là :
 A/ {x | x 5}	 B/ {x | x - 5}	 C/ {x | x 5}	 D/ {x | x - 5}
 II . Tự luận :
Bài 1: Giải các bất phương trình sau và biểu diễn tập nghiệm của mỗi bất phương trình sau
 lên trục số : 
 a/ 2x + 8 > 2 ( 1đ ) b/ 8 – 5x < -2x + 17 ( 1đ )
 c/ (x - 3)2 5 + x2 ( 1đ ) d / ( 1đ ) 
Bài 2 : Cho a < b , chứng minh 2a – 3 < 2b + 5 ( 1đ )
Bài 3 : Giải các phương trình sau : 
 a/ - 2x = 1 ( 1đ ) b / ( 1đ ) 
BÀI LÀM
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Họ và tên :KIỂM TRA ĐẠI SỐ 8 - CHƯƠNG IV
Lớp 8c Thời gian : 45 phút
Đề 1 :
 ( Học sinh làm bài vào tờ giấy này )
 I . Trắc nghiệm : ( 3đ ) ( Khoanh tròn chữ cái trước câu mà em chọn )
Câu 1 : Cho a < b , bất đẳng thức nào sau đây đúng :
 A/ a – 5 > b – 5 B/ C/ 2a + 3 < 2b + 3 D/ - a + 3 < - b + 3
Câu 2 : Với a , b , c mà a < b và c < 0 thì : 
 A/ ac bc D/ ac ≤ bc
Câu 3 : Tập nghiệm của bất phương trình 2x + 10 > 0 là :
 A/ {x | x 5}	 D. {x | x > - 5}
Câu 4 : Các số nghiệm đúng bất phương trình 3x > 9 là :
 A/ 4 ; 7	 B/ 1 ; 5	 C/ 3 ; 4	D/ 3 ; - 3
Câu 5 : Cho a - 21 < - 29 thì ta chứng tỏ được :
 A/ a - 8	 D/ a > 50
Câu 6 : Tập nghiệm của bất phương trình - 2x + 10 0 là :
 A/ {x | x 5}	 B/ {x | x - 5}	 C/ {x | x 5}	 D/ {x | x - 5}
 II . Tự luận :
Bài 1: Giải các bất phương trình sau và biểu diễn tập nghiệm của mỗi bất phương trình 
 sau lên trục số : 
 a/ 2x + 7 - 3 ( 1đ ) b/ -3x + 1 > - 8 ( 1đ )
 c / 7x – 4 < 8 +3x ( 1đ ) d/ ( 1đ ) 
Bài 2 : Cho a < b , chứng minh 2a – 3 < 2b + 5 ( 1đ )
Bài 3 : Giải các phương trình sau : 
 a/ - 2x = 5 ( 1đ ) b / ( 1đ ) 
BÀI LÀM
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Họ và tên :KIỂM TRA ĐẠI SỐ 8 - CHƯƠNG IV
Lớp 8c Thời gian : 45 phút
Đề 2 :
 ( Học sinh làm bài vào tờ giấy này )
1/ Giải các bất phương trình sau và biểu diễn tập nghiệm của bất phương trình lên trục số : 
 a/ - 2x + 8 > 2 ( 1đ ) b/ 3x + 4 - 8 ( 1đ )
2/ Giải các bất phương trình :
 c / (x – 2)2 x2 – 8 ( 1đ ) d / 8 – 5x < -2x + 17 ( 1đ )
 a / 8x – 5 < 9 + x ( 1đ ) b/ ( 1đ ) 
 c / (x + 3)2 5 + x2 ( 1đ ) d / 4x - 3 < 17 ( 1đ )
3/ Giải các phương trình sau : :
 a/ - 2x = 1 ( 2đ ) b / ( 2đ ) 
BÀI LÀM
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