Họ và tên HS:
…………………………………….
ĐỀ KIỂM TRA CHƯƠNG II
Tiết : 37 – ĐẠI 8
Năm học 2010 - 2011
Điểm
Lớp : 8/… Thời gian làm bài : 45 phút
ĐỀ 1
Câu 1(2đ)): Rút gọn phân thức :
zyx
yx
24
45
111
37
−
.
Câu 2(4đ): Tính :
yx
x
yx
x
a
22
3
1
3
15
)
+
+
−
.
xx
x
b
−
+
−
−
2
2
2
43
)
.
Câu 3(1,5đ): Tìm đa thức A biết :
x
A
xx
xx
=
−
+−
2
2
2
144
.
Câu 4(1,5đ): Thực hiện phép tính :
3
2
9
79
3
2
2
+
−
−
−
−
−
−
+
x
x
x
x
x
x
.
Câu 5(1đ): Tính :
86
1
2410
1
4814
1
222
−−
+
−−
+
−−
xxxxxx
.
Chú ý : Học sinh không được dùng bút xóa trong bài làm
Hết
Bài làm
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Họ và tên HS:
…………………………………….
ĐỀ KIỂM TRA CHƯƠNG II
Tiết : 37 – ĐẠI 8
Điểm
Năm học 2010 - 2011
Lớp : 8/… Thời gian làm bài : 45 phút
ĐỀ 2
Câu 1(2đ): Rút gọn phân thức :
zyx
yx
45
24
121
33
−
.
Câu 2 (4đ):Tính :
yx
x
yx
x
a
22
3
35
3
34
)
+
+
−
.
xx
x
b
−
+
−
−
5
2
5
82
)
.
Câu 3(1,5đ): Tìm đa thức A biết :
223
2
2
144
x
A
xx
xx
=
+
++
.
Câu4 (1,5đ): Thực hiện phép tính :
1
2
1
7
1
2
2
+
−
−
−
−
−
−
+
x
x
x
x
x
x
.
Câu 5(1đ): Tính :
86
1
2410
1
4814
1
222
−−
+
−−
+
−−
xxxxxx
.
Hết
Chú ý : Học sinh không được dùng bút xóa trong bài làm.
Bài làm
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Câu 5(2đ): Cho phân thức
22
2
3
−
−+
x
xx
a/ Với giá trị của x để phân thức thức xác định . ( 0,5đ )
b/ Rút gọn phân thức. (0,75đ)
c/ Tìm
Zx
∈
để phân thức có giá trị bằng 2. (0,75đ)