KT GIUAKI I TOAN 9.2

Phòng GD&ĐT Tĩnh
Gia
Trờng THCS Bình
Minh
bài thi giữa học kỳ I lớp 9
Môn.....................................Thời gian : 60 phút
Họ và tên : ........................................Lớp...........
Số báo danh
Số phách
Điểm
Giám thị số 1........................
Giám thị số 2:.......................
Số phách
I. Phần trắc nghiệm:
Câu 1: Điền dấu (<; >; =) thích hợp vào ô trống:
a)
4
416

b) 3
7
c)
3
3
3
3
d)
32
23
Câu 2: Hãy điền Đ ( nếu đúng), điền S ( nếu sai) vào ô trống của các khẳng định sau:
Tam giác ABC vuông tại A, cạnh huyền là a, các cạnh góc vuông là b, c. Khi đó:

a) b = aSinB
b) b = aCosB
c) b = cTgC
d) b = cCotgC
II. Phần tự luận:
Câu 3 : Rút gọn các biểu thức sau:
a)
2
)24(

b)
y
y
7
63
2
(với y > 0)
c)
aaa 49169
+
với a 0
Câu 4 : Cho tam giác ABC vuông tại A, đờng cao AH; AB = 3cm, AC = 4cm.
a) Tính độ dài BC, AH.
b) Đặt BAH = , tính tg ?
Câu 5 : Cho biểu thức:
1
42
:
1
4

1
4
2











+

=
x
xx
x
x
x
M
( Với x và x 1 và x 4)
a) Rút gọn M.
b) Tĩnh giá trị của M khi x = 3 + 2
2

Không viết vào phần có hai gạch chéo này
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