KiÓm tra bµi cò:
!"#$%&'&
()*+,&-$*.
&-$/012& )&
3&012&
4
5
6012& )&
5
Bµi 1:7&$& 8&9*. !")01
2& )& 3&012&
:%
&-$*.;&<.,=,&
6 =>
≥ 0 ,
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#B-7C5(
D
⇒
DD
C)≥ 0 &E&
⇒?@%&-$<.,
=,&
F
5
√
√
D¹ng 1.6012& )&8&=>G&0H
Bµi 2( bµi 37/56/SGK6012& )& 3&012&
4
F!
5
√
I.?I.JKJ668&=>G&0H
?
?
5
K
!5
√
Híng dÉn :
LM =>
%
M =>√*N≥ 0.
M! O≠ - 1; x ≠ 0.=>
⇒
D¹ng 2.6012& )&8&=1*+P
Bµi 4 (bµi 39/57/SGK).
?
?QQ
! ?
?
Híng dÉn vÒ nhµ.
JRNS-&;T9012&
)&UV*+012& )&'
J.'0*+&.,KF4FWJQFKJ6
WFJFQJI