TRƯỜNG THPT VÕ GIỮ
Họ và tên:…………………. KIỂM TRA MỘT TIẾT
Lớp 11A… Môn: ĐS & GT 11 (KHTN)
Đề 1
I/Trắc nghiệm (5 điểm) Chọn đáp án đúng
C©u 1 .
Giới hạn sau đây bằng bao nhiêu:
4 4
lim
x a
x a
x a
→
−
−
A.
2a
2
B. 3a
4
C.
4a
3
D. 5a
4
C©u 2 .
Giới hạn sau đây bằng bao nhiêu:
3
3
lim
3
x
x
x
−
→
−
−
A.
1 B.
−6
C.
0 D.
−1
C©u 3 .
( )
lim 2 5.3−
n n
bằng:
A.
+∞
B.
−∞
C.
0 D.
2
3
−
C©u 4 .
Số thập phân vô hạn tuần hoàn 0,17232323.... được biểu diễn bởi phân số:
A.
153
990
B.
1706
990
C.
157
990
D.
1517
9900
C©u 5 .
Giới hạn sau đây bằng bao nhiêu:
2
2
2
3 2
lim
( 2)
x
x x
x
−
→
− +
−
A.
0 B.
−4
C.
−∞
D.
+∞
C©u 6 .
Cho hàm số
2
2
2
( ) .
2
2
x x
khi x
f x
x
m khi x
+ −
≠ −
=
+
= −
Hàm số đã cho liên tục tại x = − 2 khi m
bằng:
A.
m = -3 B. m = -1
C.
m = 1 D. m = 3
C©u 7 .
Tìm giới hạn
)7725(lim
22
+−−+−
+∞→
xxxx
x
A.
1 B.
∞
C.
5
2
−
D. 2
C©u 8 .
( )
1
lim 3
3
−
÷
+
÷
+
n
n
là:
A.
3 B. 4
C.
0 D. không tồn tại.
C©u 9 .
Trong các giới hạn dưới đây, giới hạn nào không tồn tại?
A.
( )
2
1
lim
1
x
x
x
→−
+
B.
x 0
lim
1
x
x
→
+
C.
2
2 1
lim
1
x
x
x
→−∞
+
+
D.
lim cos
x
x
→+∞
C©u 10 .
Giới hạn sau đây bằng bao nhiêu:
2
lim( 1 )n n+ −
A.
2
1
B. 0
C.
1 D.
∞
II/Tự luận (5 điểm)
Bài 1. Tính các giới hạn sau:
a)
13
2
lim
2
2
++
+
nn
nn
b)
2
2
4
9 20
lim
4
x
x x
x x
→−
+ +
+
Bài 2. Xét tính liên tục của hàm số
2
1 3
( )
2 3
3
2 6
x khi x
f x
x x
khi x
x
− ≤
=
− −
>
−
trên tập xác định của nó.
Bài 3. Chứng minh rằng với mọi giá trị của m phương trình (m
2
+ 1)x
4
– x
3
– 1 = 0 có ít nhất 2 nghiệm nằm trong
khoảng (– 1;
2
).
BAØI LAØM
I/Trắc nghiệm.
01 04 07
02 05 08
03 06 09
10
II/Tự luận.
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