A) (X1)(X2 X 1) X X( 2)(X2) 5B) X1 3 X 136X12 10C) X3X23X 9 X X 2 2 X1D) X1 3 X3X23X 9 3 X242
Bài 4: Tìm
x
,
biết:
a)
(
x
1)(
x
2
x
1)
x x
(
2)(
x
2) 5
b)
x
1
3
x
1
3
6
x
1
2
10
c)
x
3
x
2
3
x
9
x x
2 2
x
1
d)
x
1
3
x
3
x
2
3
x
9
3
x
2
4
2