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K× THI TUYÓN SINH líp 10 THPT N¨M häc 2011 - 2012 M¤N THI: TOÁN Thời gian làm bài: 120 phút không kể thời gian giao đề Câu 1 (2 điểm):   25 9+  2 ( 5 1) 5− −   2 1 : x y xy x y x y + + + −  !"# !$% ≠ # &'(!)($%#(!)) Câu 2 ((2điểm): *+, /01."12&%-34# ( $%#56( 1.71-128+ Câu 3 (2 điểm):  1.9%'8:;"<=9%>=.)-$%1.9%-?1@A B78:;C%D-  8--1E@>F( x G-!H/-EI/ Câu 4 (2 điểm) J71@AKLMN$%1-O-7%1@AK*P<E#<"J$1@A KL"JC%:P<E1-N  J-MJC%.P<EQ+$*P<E#<"J  RC%1@AS1@AKLMNJ-JRTTM  J7M("US1@AK.P<E-J Câu 5 (2 điểm) 8-34V+<GWLN(!))"71HWLNC%X:34 HƯỚNG DẪN GIẢI Câu 1 (2 điểm):   25 9+ DG5Y  2 ( 5 1) 5− −  ( 5 1) 5 5 1 5 1− − = − − = −  2 1 : x y xy x y x y + + + −  !"# !$% ≠ #  2 2 ( ) 1 : .( ) ( )( ) x y xy x y x y x y x y x y x y x y x y + + + = − = + − = − + − +  '(!)($%#(!)) ) Câu 2 ((2điểm): *+, /01."12&%-34# ( $%#56( 1.71-128+ N *12&+, /0 x -2 -1 0 1 2 y = x 2 4 1 0 1 4 *#5F( J7! #F(J7) #) ZWV$* Z7%1.71-12&%-34# ( $%#56(C%/-E@>8  ( 5F( ( F5G(! HGG!  ) ) # ) )  ( ( # ( [ ;#1.71-128+C%L))N$%L([N Câu 3 (2 điểm):  \=9%C%L-NL]^ )N"=.3*C%6)L-N 81.9%-?1@AB78:;C%D-_E90#7H  ( GLF)N ( D (  ( G ( F(G)6(D! ( ( 6(6([! ( F6)(! W# ) [L`N  ( F5LC7'N ;#=9%C%[-"=.C%5-   R J  8--1E@>F( x G-!L)NH/-EI/ ]a x L]^ ≥ !N L)N ( 6(G-!L(N ]EL)NH(/-EI/8EL(NEbH/-9@> EL(NH/-9@> ' 1 2 1 2 1 m 0 x x 2 0 0 m 1 x .x m 0  ∆ = − ≥  + = > ⇔ < ≤   = >  ;#$ 0 m 1< ≤ EL)NH(/-EI/ Câu 4 (2 điểm) H · 0 ABO 90= LTC%PP<E#<N · 0 ACO 90= LTPP<E#<NcZM   · · 0 ABO ACO 180+ = ;#MJ.P<E1@AK1@ASM F*1@AK1@ASM"1@AK%# dLMN'$%J - Q4JHP<E#<e$* \ZC%71-J$%M fB ∆ JHJ  ∆ JI' R71HZ12A$gC%1@AEI"1@A7"1@AV ∆ J ZZJ fB ∆ JRHZZJLJ`+N MMJLN  MZC%1@A8 ∆ JR  JRTTMZ#JRTTM c. ABC∆ C%-I MZT( cC%71-M$%LMN97M(+cC% 1-M"-%cTZ(T5+cC%I--J$%hC%I-1@AK.P<E  ABC∆ "$;#S1@AK.P<EcZT( Câu 5 (2 điểm) 8-34V+<GWLN(!))"71HWLNC%X:34 Q<H)"("5:348GWLNi)!!!GjGjGji(!)) <HD:34kC+8GWLN )!!!! (!)) ;#H[:34 n abcd= 97i(!))+)7a( TH1:(H< b 0≠ 7a c 0≠ 8GWLN (!))l Q+!$%!S1H 200d 2 d 2011+ + = mCn$8oKCp TH2:)"<ij8GWLNi)j!!G)G5ji(!)) Q+j"S1HL)j!!G)!G9NG)GjGG9(!)) Z#))G(9)!)97 d 9≤ +)!)))G(9 ≥ ))G)Y 83 c 11 ⇒ ≥ +Y7aj <Y8))YG(9)!) ⇒ 9)5T($mCn $;#j ⇒ 9) qC')jj)G)GjGjG)(!))7b-r;#(!)) . K× THI TUYÓN SINH líp 10 THPT N¨M häc 2011 - 2012 M¤N THI: TOÁN Thời gian làm bài: 120 phút không kể thời gian giao đề Câu

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