KiÓm tra bµi cò: !"#$%&'& ()*+,&-$*. &-$/012& )& 3&012& 4 5 6012& )& 5 Bµi 1:7&$& 8&9*. !")01 2& )& 3&012& :% &-$*.;&<.,=,& 6 => ≥ 0 , ) ?@ A.& ?@@ !")?@@%&-$<. #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