!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!" #$%&'()*+,- /0 !!&',12) #)*+ 3452)6+78-&)9:) ,16;)<:'=7>=+?)7@=A-=BC)D:7E0)F)G=&C&H! @=I HJK&,L:A-=C@'62HJK&,L237H+FMAN -OP4Q4 P RS 2OITU4VS 7OP4'TIWS GOX4Y'ZX[S Câu đúng được chọn là @=P :+RL -OU+T\RUT\2OU+T\[UT\7OU+T\]UT\ GOU+T\VUT\ Câu đúng được chọn là @=U JK&,L:A-=7^P&)_+ -O IP =+x 2O4ZP]U4TCâu đúng được chọn là : @= &)_+78-797JK&,LA-=6 -O PI =−x 6!!!!!!!!!!2O U =−x 6!!!!!!!!!! 7O I −=−x 6!!!!!!!!!!!!GO ` =− x 6!!!!!!!!!!!!! )I -O:+T\RTa!:A9+b 2O:-R2c7d&+) Q\-WQ\2 )P )1)2HJK&,LA-= -OIP4Z\RTIX2OI4TUeZPS4ORUS )U L+4A-:7:&f-,g78-2)*=d74Q(h&iK&)9,g78-2)*=d74ZP ) )1)JK&,L IP\ =− x )6+ !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 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7O I −=−x 6!!!!!!!!!!!!GO PI =−x 6!!!!!!!!!! )I -O:+T\WTa!:A9+b 2O:-W2c7d&+) Q\-RQ\2 )P )1)2HJK&,LA-=2)*=G)j3&)_+,,k7AN -OIP4Z\WTIX2OI4TUeZPS4ORUS )U L+4A-:7:&f-,g78-2)*=d74Q(h&iK&)9,g78-2)*=d74ZP ) )1)JK&,L \ IPx + = )6+ !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 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!YLqA-=2)*=G)j3&)_+78-2HJK&,L -5 0 -Y4RS2Y4RT7Y4 ≤ TGY4 ≥ T "#$% eCO)1)7972HJK&,LA-=2)*=G)j3&)_+,,k7AN -YU4Z ≤ P4ZU 2Y \ x− WTU 7YQP4 ≤ U4QX eICO:-W2!d&+)TP-ZURTP2ZU eICO)1)JK&,LU4Q] x &A eUCO ?)7@=C&CJu7ScC! @= I P U X #99 2 2 - - 7 G @=IT2c@=PQ2c@=UQ-@=Q-c@=Q7c@=XQG "#$e`CO B -YU4Z ≤ P4ZU ⇔ U4QP4 ≤ UQeScCO ⇔ 4 ≤ QIeScPCO s3']v4Y4 ≤ TIweScPCO xLqC&eS!CO -1 0 2Y \ x− WTU ⇔ \T4WTIPeScPCO ⇔ T4WTPSeScPCO ⇔ 4ReScPCO s3']v4Y4RweScPCO xLqC&eScCO 0 4 7YQP4 ≤ Ue4QPO ⇔ QP4 ≤ U4QXeScPCO ⇔ TP4QU4 ≤ TXQeScPCO ⇔ T4 ≤ TISeScPCO ⇔ 4 ≥ PeScPCO xLqC&eScCO 2 0 :-W2!d&+)TP-ZURTP2ZU y-W2A=',-QP-RTP2e@-)n7:QPOeScCO r:C^TP-ZURTP2ZUeF&-)n7:UOeC7+OeScCO U4Q] x !sL x ] x neáu x 0 - x neáu x < 0 ≥ eScPCO-7^-),J;&u U4Q]4en=4 ≥ SO ⇔ U4Q4] ⇔ P4] ⇔ 4]Pe3OeScPCO U4Q]T4en=4WSO ⇔ U4Z4] ⇔ 4] ⇔ 4]Ie6:z)OeScPCO s3'3&)_+]vPweScPCO &'()&*+,- ./0!%1 2 &3 l'77@=C& 4]TP6&)_+78-2HJK&,L -YTU4ZPWTa 2YTU4ZPRT 7Y4ZIR`TP4 GYISTP4WP ,:&7972HJK&,LA-=c2HJK&,L:(h&62HJK&,L237H +FMb -YP4TWS 2Y4 P RS 7YX4ZISRS GY4TPWIP Yn=TU-WTU2L -Y-R2 2Y-W2 7Y-]2 GY-V2 Y&)_+78-2HJK&,LP4RPS6 -Y4R2Y4WQIS 7Y4RISGY4WPP YLqA-=2)*=G)j3&)_+78-2HJK&,L 0 5 -Y4R2Y4WS7Y4RT GY4W !Y:-+&)97c(o&CgC&6 -Y p p p A B C+ + > I\S S 2Y p p A B+ ≥ I\S S 7Y p p A B+ < I\S S GY1-c2C& "#$% eCO)1)7972HJK&,LA-=2)*=G)j3&)_+,,k7AN -Y\4ZPW`4QI 2Y II X U x− < − ePCO:-R2!d&+) -YP-ZURP2ZI 2YQ-WT2 eICOiGH=&)9,g='_CN),&2)*=d7 ]P4ZUZ Ux− ()4RS &A eUCO ?)7@=C&CJu7ScC! @=IT2c@=PQ2c@=UQ-c@=Q7c@=QGc@=XQ7 "#$e`CO -Y\4ZPW`4QI ⇔\4Q`4WQIQPeScCO ⇔4WQUeScPCO s3']{4|4WQU}eScPCO xLqC&eICO -3 0 2Y II X U x− < − ⇔ TII4WTI\eScPCO ⇔ TII4WTPPeScPCO ⇔ 4RPeScPCO s3']v4Y4RPweScPCO xLqC&eICO 0 2 -Yy-R2c@Pn78-#0)P-7^P-RP2ceScPCO F&Pn78-#P-RP20)I7^P-ZIRP2ZI!eScPCO r:URIc7F&Pn78-#URI0)P-7^P-ZURP-ZIeScPCO <:f7H2{77>=-A=',-P-ZURP2ZIeScPCO 2Yy-R2c@Pn78-#0)TI-7^T-WT2ceScCO 7F&:71Pn78-#T-WT2-CJu7T-WQ2eScCO ]P4ZUZ Ux− ()4RS )4RSc-7^TU4WS Ux− ]TeTU4O]U4eScCO s3']P4ZUZU4eScPCO ]4ZUeScPCO &'()&*+,- ./0!%1 2 &3 l'77@=C& Y,:&7972HJK&,LA-=c2HJK&,L:(h&62HJK&,L237H +FMb -Y4TWS 2Y4TUWa 7YP4ZISRS GYS4ZRS Y&)_+78-2HJK&,LU4RP6 -Y4RPI2Y4WQPI 7Y4R\GY4W\ Yn=T-WT2L -Y-]2 2Y-W2 7Y-R2 GY-V2 :-+&)97c(o&CgC&6 -Y p p A B+ ≥ I\S S 2Y p p A B+ < I\S S 7Y p p A B+ ]I\S S GY p p p A B C+ + > I\S S Y4]U6&)_+78-2HJK&,L -YP4ZUWa 2YT4RU4QIP 7YT4RP4Z GYTP4ZWT !YLqA-=2)*=G)j3&)_+78-2HJK&,L 0 15 -Y4WS2Y4WI 7Y4RTIGY4RI "#$% eCO)1)7972HJK&,LA-=2)*=G)j3&)_+,,k7AN -Y4TISRU4QP 2Y ` P − > x ePCO:-R2!d&+) -YP-ZRP2ZP 2YUQ-WUT2 eICOiGH=&)9,g='_CN),&2)*=d7 ]P4ZZ x− ()4RS &A eUCO ?)7@=C&CJu7ScC! @=ITGc@=PQ7c@=UQ7c@=Q2c@=Q2c@=XQ2 "#$e`CO eCO -Y4QISRU4TP ⇔ 4QU4RTPZISeScPCO ⇔ P4R\eScPCO ⇔ 4ReScPCO s3']v4Y4RweScPCO xLqC&eICO 0 4 2Y P x− R` ⇔ T4RIeScPCO ⇔ T4RISeScPCO ⇔ 4WTPeScPCO s3']v4Y4WTPweScPCO xLqC&eICO -2 0 ePCO -Yy-R2c@Pn78-#0)P-7^P-RP2ceScPCO F&Pn78-#P-RP20)P7^P-ZPRP2ZP!eScPCO r:RPc7F&Pn78-#RP0)P-7^P-ZRP-ZPeScPCO <:f7H2{77>=-A=',-P-ZRP2ZPeScPCO 2Yy-R2c@Pn78-#0)TI-7^T-WT2ceScCO 7F&U:71Pn78-#T-WT2-CJu7UT-WUQ2eScCO eICO ]P4ZZ x− ()4RS )4RSc-7^T4WS x− ]TeT4O]4eScCO s3']P4ZZ4eScPCO ]`4ZeScPCO . )1)2HJK&,LA-=2)*=G)j3&)_+,,k7AN -OIP4ZWTIX2OI 4 TUeZPS 4 ORUS )U L+ 4 A-:7:&f-,g7 8- 2)*=d7 4 Q(h&iK&)9,g7 8- 2)*=d7 4 ZP ). Y&)_+7 8- JK&,L x 5 1− = 6 -Y 4 ]SB 4 ]X 2Y 4 ]X 7Y 4 ]B 4 ]X GY 4 ]IB 4 ]! !YLqA-=2)*=G)j3&)_+7 8- 2HJK&,L -5 0 -Y 4 RS2Y 4 RT7Y 4 ≤ TGY 4 ≥ T "#$% . GY 4 TUWa Yn=TP-RTP2L -Y - ]2 2Y - W2 7Y - R2 GY - V2 Y&)_+7 8- 2HJK&,LP4RIS6 -Y 4 R2Y 4 W 7Y 4 RTGY 4 WIS