Bài kiểm tra 45'''' Đại 8_2010

Trường THCS Chiềng Cơi
Họ và tên:…………………………………………………………

Lớp: ………….
Ngày tháng năm 2010
BÀI KIỂM TRA 45 PHÚT
Môn: Toán 8
Điểm Lời phê của giáo viên
ĐỀ BÀI
I. TRẮC NGHIỆM (2 điểm):
a. Điền vào chỗ trống (…) để được nội dung quy tắc.
1. Muốn nhân một đa thức …………………………………………………………………………, ta nhân
mỗi hạng tử của ………………………………………………………………………… với từng hạng tử của
………………………………………………………………………… , rồi …………………………………………………………………………
với nhau.
2. Muốn chia …………………………………………………….. cho …………………………………………………………
(Trong trường hợp các hạng tử của đa thức A chia hết cho đơn thức B), ta chia
…………………………………………………… của A ……………………………………………… rồi ……………………………………
………………………..
b. Ghép cột (1) với cột (2) để được đẳng thức đúng vào cột (3):
Cột (1) Cột (2) Cột (3)
1.
2 2
x 2xy y− +
a.
2 2
(x y).(x xy y )+ − +
1- ………………
2.
3 2 2 3
y 3xy 3x y x+ + +

b.
2
(x y)−
2 - ………………
3.
2
(x y)−
c.
3
(x y)+
3 - ………………
4.
3 3
x y+
d.
3 2 2 3
x 3x y 3xy y− + −
4 - ………………
II. TỰ LUÂN (8 điểm):
1. Rút gọn biểu thức:
a.
(x 2).(x 2) (x 3).(x 1)+ − − − +
.
b.
2
(x 3).(x 3) (x 3)− + − −
.
2. Phân tích các đa thức sau thành nhân tử:
a.
2 2

x 4 (x 2)− + −
.
b.
2
x 3x 2− +
.
3. Thực hiện các phép tính sau:
a.
5 4 2 2
(25x 5x 10x ):5x− +
.
b.
3 2
(6x 7x x 2) :(2x 1)− − + +
.
BÀI LÀM PHẦN TỰ LUẬN
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