1 1 1X1 1 1A) 0 B) (X1)(X 1)3 C) (X21)(X2 1) D) (X 1) (2 X1)2
Câu 91. Tính định thức:
1 1
1
x
1 1 1
a)
0
b)
(
x
1)(
x
1)
3
c)
(
x
2
1)(
x
2
1)
d)
(
x
1) (
2
x
1)
2
.
x
x
1
1 1
2
2
1 1
.