Kiểm tra 45 phút ( HK I )

Họ và tên : KIỂM TRA 45 PHÚT ĐẠI SỐ
Lớp : ĐỀ A
Bài 1: ( 2 đ )
a/ Phát biểu quy tắc khai phương một tích ( 1 đ )
b/ p dụng . Hãy tính :
28 7
32.98 ;
7
−
( 1 đ )
Bài 2 : ( 2 đ )
Rút gọn và tính giá trò biểu thức
A =
2
16 4 4 1a a a− − − + với a =
1
4
−
Bài 3: Tìm x, biết ( 3 đ )
a/
1
9 27 3 4 12 7
2
x x x− + − − − =
b/ x – 7
10 0x + =
Bài 4: ( 3 đ )
Cho Q =
3
1
1 1

x x x
x
x x
 
−
+ +
 ÷
 ÷
−
− +
 
với x
≥
0 và x
≠
1
a/ Rút gọn Q
b/ Tìm x để Q = -1
Bài làm
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Họ và tên KIỂM TRA 45 PHÚT ĐẠI SỐ
Lớp ĐỀ B
Bài 1:
a/ Chứng minh đònh lý:
"
Với mọi số thực a thì
2
"a a=
( 1 đ )
b/ p dụng : Tính
2 2
(2 5 ) ; ( 3 )a− −

với a < 0 ( 1đ )
Bài 2: Tìm x biết
12 18 8 27x x+ = +
( 2 đ )
Bài 3: Chứng minh đẳng thức ( 2 đ )

5 3 5 3
8
5 3 5 3
+ −
+ =
− +
Bài 4: Cho A =
2 9 3 2 1
5 6 2 3
x x x
x x x x
− + +
− −
− + − −
( 4 đ )
a/ Rút gọn A
b/ Tìm các giá trò của x để A<1
BÀI LÀM
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Họ và tên : KIỂM TRA 45 PHÚT ĐẠI SỐ
Lớp : ĐỀ C

Bài 1: Chứng minh đònh lý : Với a
0≥
và b
≥
0, ta có
. .a b a b=
( 2 đ )
Bài 2: Chứng minh đẳng thức
( ) ( )
1
12 6 3 24 . 6 5 12 14,5. 2
2
− + − + =−
( 3 đ )
Bài 3: Trục căn thức ở mẫu :
26
2 3 5+
( 2 đ )
Bài 4: Cho biểu thức P = (
4
).
2 2 4
x x x
x x x
−
+
− +
với x > 0 và x
≠
4 ( 3 đ )

a/ Rút gọn P
b/ Tìm x để P > 3
BÀI LÀM
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