Bài tập đại số lớp 8
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BÀI TẬP
Bài 1: Rút gọn phân thức:
a)
14 xy 5 (2 x − 3 y )
21x 2 y (2 x − 3 y ) 2
b)
y 2 − xy
4 y 2 − 4 xy
15 xy 3 x 2 − y 2
e)
21x 2 y 3
24 x 3 y 2
f)
(
20 x y ( x + y )
2
2
8 xy (3 x − 1)3
12 x 3 (3 x − 1)
d)
25 x 3 y
20 x 2 y 2
h)
c)
)
g)
x 2 − 25
x2 − 5x
18 xy 3 x 2 − y 2
(
15 x y ( x − y )
2
2
)
Bài 2: Quy đồng mẫu thức của các phân thức sau:
a)
5
4
2 3 và
4x y
3x 3 y 2
c)
x +1
x+2
vµ
2
x−x
2 − 4x + 2x 2
b)
3
2
3 2 và
4x y
3 xy 3
x −1
2
d) 2 4 vµ
6x y
4 xy 3
BÀI LÀM
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