®Ò kiÓm tra
M«n :To¸n
Thêi gian :45 phót
C©u 1 (5®)
Gi¶i c¸c pt sau :
a)
2
1 3 4
1 1 1
x x
x x x
+
+ =
− + −
b)
4 5 4x x+ = −
c)
2 1 1x x+ = −
C©u 2 :(4®)
Cho ph¬ng tr×nh :x
2
-2(m+1)x+m
2
-4=0
a)Gi¶i pt víi m=1
b)X¸c ®Þnh m ®Ó pt cã hai nghiÖm mµ x
1
.x
2
=0.TÝnh c¸c nghiÖm ®ã .
c)T×m m ®Ó pt cã nghiÖm

x
x x
x
x x
x
+ + −
+
⇒ =
− −

−
=


⇒ − − = ⇒

+
=


b)
dk :x
5
4
−
≥
( )
( )
2
2





=


c)
1 0 1
2 1 1 2
2 1 1 0
x x
vn
x x x
x x x
− ≥ ≥
 
 
⇔ ⇔ ⇔
+ = − = −
 
 
 
 
+ = − =
 
 
0,5®
0,5d
1d

m
m
−

+ ≥


≥
∆ ≥

⇔ ⇔ ⇔ = ±
  
=
− =



= ±

+)m=2
2
0
2 0
2
x
x x
x
=

⇒ + = ⇔

x y y
+ = =
 
⇔
 
+ = =
 
1,5d
1d
0,25d
0,25d
1d
1d