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:
ơ
A(x)0 x D
ơ
ơ
1:G
ơ
x 1
x 1
2
2
x
9
x
9
x 3 2 x 3 0, x 1
Do
x 1 2
x 1 2
ơ
t:
-
Page giọt nước!
2 x3 3x 2 17 x 30 2 2 x 1 0
x 1
2 x 2 9 x 9 0
x 1 2
A(x)=
x 1
2 x2 9 x 9
x 1 2
ơ
x 1 .
ơ
1)
ơ
x2 2 x 7 2 x 3
2)
x 2;4
1 4 x
1 x 2
x2
x 3
1
0x 2;4
1 4 x
1
0x 2;4
1 x 2
1 x 2
x 2 1
x3
1 4 x
-
ơ
x 2 1 2x2 6x 0
x 3 x 2 2 x x 3 0
x3
1 4 x
x 2 1
1
x 3
1 4 x
x3
do
i
1
1 4 x
x2
2x 1
x 2 1 1 4 x
x 3
ơ
ơ
ơ
:
1)
ơ
4 x 1 2 x 2 3x 1
2)
ơ
x 2 4 x 2 3x 1 2 x 1
3)
ơ
x
x 1 1 3 x 6
x2
4 x 1
x 1 1
3 x6
4 x 1
x 2
x 1 1
x2
do
4 x 1
x 1 1
3
3
x 6
3
16 4
3
x 6
2
2
4x 3 0
4 x 3 0x 1
t
-
1
2
3
x6
ơ
x 2 4 x 1 3x 1 2 3 3x 5
4.
ơ
Page giọt nước!
5 x 3 x 1 2 x 2 3 x 2 3 3x 2 5
ơ
ơ
ơ
x 1
x 1 1
3
3x
2
5
2
x 1 0
2
x2 x 4
x 1
x 1
1 0
2
2
2
x 3 2 x 1 x 1 3 3x 2 5 3 3 x 2 5
x 1
2
1 0x
ơ
-
t:
x
2 x 1 x 2 3
x 1
-
2
ơ
5
1)
ơ
2 x3 x 2 x 1 x 2 x 2 x 1 3 2 x 2
2)
ơ
Page giọt nước!
-
, x 2 .
x 2
x 1
x2
x 1 x 2
2
1
m
m n 1
3
2m n 2 n 4
x43 x2
x 7 3 x 2 3x 10 0
ơ
x 2
x 1 x 4 3
3 x 6 x 7
x 6 x 7
ơ
x 7 3 x 2 3x 10 0
x 2
x7 3
x 2 x 5 0
x 5 0x 2
x=2
ơ
ơ
1)
ơ
3x2 14 x 13 x 1 4 x 5 2 x 5 x 3
2)
ơ
5x2 3x 1 2 x 17 x 28 3 x 13 2 x 1
3)
ơ
2 8x2 7 x 1 x 1 2 x 3 2 3x 1 4 x 2
Page giọt nước!
6:
t 2
3t 2 4t 8 0
2
2t 1 t 1
t2
4t 3 t
Do
2t 1 t 1
2
3t 2 4t 8 0, t 0
ơ
t.
t
ơ
ơ
1)
:
ơ
ơ
ơ
-
ơ
ơ
N
ơ
ơ
.
4 x 2 22 3x x2 8 TH & TT T11 / 396
x 2 4 x 2 x 5 2 x 2 5x TH & TT T 4 / 388
ơ
x2 14 x 1 3 2 x 1 2 9 x 4 2 4 x
ơ
n nh
“
e
ỉ
Page giọt nước!
x 1 3 x x 2 2 TH & TT T 4 / 419
D
!
ơ
!