

 !
"#
I. L thuyt(2 đim):
$%!&'()(!*++,-!.++/01(!.+2%+(3
456
7
 
 7 
x
x x x
+
+
+ +
B. Bi tp(8 đim):
Bi 1(2 đim):809!.+&:!

7
7
7 
7  
D x x
x x x
−
=
− − +
Bi 2(3 đim):;+<=!>

7
7 7

( )
7
7  
? @

x x
x
x
− −
×
−
−
B. Bi tp(8 đim):
Bi 1(2 đim):809!.+&:!

7 7
7
7   
E x
x x x x
+
=
+ + +
Bi 2(3 đim):;+<=!>

7
7 7
    7
 7  7   
x x x