18 1 .., 1 X 1. x - -X, < J. 1 ---4 2- -)<.+\)0 2 01 [x - 12x - 111 + @-X+ ,z)(--t <0 ~ <: 1 I'll x, )(+ 3. 3X - 1 I ---'t -L~x-I)I 4. 1- ~-+ -sx + 1 I I! PC") X ~_l, t 2. 2 ---..., -\ (x-z tes+ 3 1tvi1nuoUell~~ellUd 1 ---'t - "" lJ 21 < 1 Lttll Ix2 - 41 tJel ~fli1lil1'Wl'WluoUvl~\9ieliUd 1. 1 Ix-.zl .., < '2 Hell [x 01 3. 4 < .i ~ 1--3) -.::, 1 ~ X ('3 , y U~~ z dJ'WllTW1'W:U~~ tt~~ x ~ Y 1. 9z3x2y 2. 3x2yz ~ 15\ = ""5 ~ ---"' 1 <)< 5 2 < 9 OZ'lxl._41< 3x2y fi19Jt)~ (z ~ x) ~ y flt)<Ut)1~ @ 27X2yz4 4. 9X4y2z 2 19 1'1-1'Ix - yl < 5 uae @ IX2 - xz - xy 4 IY - 3. ':r.x ( 1. z] < :J( - 2.) - <" - 1 3. - 5 2) ~ ( ,,- c 5 < 5 GJ 11 ~ < 1 -Z) I.X-)11 b<- z: 2 z] < 19 I 17<~'J' 91><-2) ~O \'(;VI 20/ ~ >..!. 4 -t <. X- 2 4· );<._'\ c J.x -1'-z i~II~~'()~.1.1!'11 i. X lX-YI -'t Ix-zl < ~® /j '1 --1 @-0) \~ >(-'1- ----) c ) -z -q < Cl ~ t '1-2 I ~ ~~ ./'V Z I L.. q fhyru~l'l1a, b, c Lll'U~TU11H~hJ ~-:J 1 < a < 7 t11rh\9)tl'U'Utl-:J'fflJf11'J ax 2 r ,r 1~tlv\r + r := 0 U~~ Ir - r I = 1 Utl1 12 12 12 5 4 I I ~ I (x. -:J ) 0< -.L 110'1 -9 I I<5 Y x - z X- 2. 4. \2X - y - I ~-'n<. yz] < 20 + 1 .. I X-y\IX-z\ ~. O~ I [x - z] < tJ \91tllui1~tl1~HJf1#lf)-:j + bx + C = 0 ~tl s» a)(x - b)(x - c) < lCJ5\9)fll\9)tl'U6ijtl-:J(x - CV (-00, -1) U (0, 4) 0 1~lwum9itllt1i1 ~tl"l51-:J 2. (-00, 0) U (1, 4) 3. (-00, -2) U (0,5) 4. (-00,0) U (2,5) 1 I r, -Yz.' ~ z. 1- r "1. -+ I --4 ..•.. i, 1- z. - 2. )-" v- 2- ~ t, )- ~ of t, rZ, \ (r, -+lr, rJ.. - = l.t-Irt..' - 2.1"1/"1- ----v------- +1'z..)1.. - tfr, •... 1. e 1 1- c :. -1 --l '4 CA (X-4- )(X-o){" .•.. ,) < 0 ~ _" la A~==~~{x Ix = s", n A e, e = C~-l -.la -.., 4 ~- ~ C-t'P,-IH> (0,4) dJ'Wil'W1'Wl~ 1'U1f)} 6JJf)fl1111hwif)1ui1flf)~f)~ ~ 2. 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A .X I r 1\ ~lO~iJ~;)C'MJ(lM If<l(\~. ~~ / nu tli "'14il! ~ 01~~0~~.,1\. 20 'V 111a, b, 7 c ua~ d c;:::$. ~ 1. ab > 2. 61 b < a mll o ~lhn)1'UTWi)1 1l~'W1l1'jWT;h~B1~~tallilflf)~B~ <U , na~ b > <~ .I > 0 f)~fH1H) a 'V o..J • 0 rmuu 0 ! .ffaf ~iJ'W~1'W1'WB~1'jf)tJ~ 0'1 a ~iJ'U~1'U1'UB~'j'jf)tJ~U~J v 'V 2 4. rno < a < 1 u(;n a > a X 1. l-q '-Wi)::. 0 6'HJb E 3 -t I 8 a l ---...., 2 .l <Q 1 ~ tVG1nn'Ji l ~J ;! 4 v ~flflll'lJ~flltJil s: \[3\ l -'I 1 o < (-z) 0C1JJ(\t\)~ 0. = 1 . b q j J.. ° UCl~a b > ° a 0'1 a > 0, b > ::j:. b mi'1 Q< =I=- b U"'d a 2 UYlJfl a b > -1 + -1 tll'lJf) a2 a b -. +- t11 a > 0, 3. 0'1 a2 + b2 = 1 U"~ c2 + d2 = 1 U"1 ac + bd ~ 1 tll'lJf) Ufl~ ~ 2 0 @ 0. b2 J 0'1 a tW~ b tih!1l1'tnUlj)l~tt"1 ~ b 1. !l +.E...( 2- ~ <: 2 ---'+ bl. • b = Z 2ab - + 0 lli~lLtJu~f)~liL'wtJ~fh\9lB1JL~hn _1 '/0 bl.~o Cl L]e 0.. b ~ .?.•. b 3 -~ bi'l -alJ2 / co:+b)ifi~)",>o vi I ~ 1.bt Cl:th1. ~,x+!?:O ~~MJI:,i-lI~""?~CVl01.t~ t- X~7;o~ --, (l\-b)2~O > 1 J~Jl7b'U\J 0 1~tJifi X, + 2. 4. [x] + -..,[a1._bl ) (a.k) )0 a.2~1.. ~ b\ot't~z.bcJ.-@ ./ 2. -'G\C+!%t~l z.1~r;'2.'t;"1()1J ?l. a~",,;'. t/' :+ ~ tJ)~ ~. 'J"cV~ z "3. ,'«-+'11 L.. IJ<I-tly) X <U()l.J1l1~ ~x~o,Y5a ,nle\) "f.~oJ'I= Ix-+'I' "fro' Ix H y > ~ .. ~ 'f ova ~ 0 ~\j ~ -l 0 10 CV; ~ 6NI>:'h?f.j ;: IX1+\I(\./ ~1)(1~~q 0 [x + YI = Ixl + Iyl 0 1c\. X t, 4· x iT dJ'U~1'U1'W1l1~ ~B1~~B'llU\lf)~B~ vl < [x] + Iyl X'3o)'1~o o.1c10U1&<.JI >0 b 1. at. 1. x+y>o [x ""V-(tt-b) ~("-I,) 3 la-t>'2.>.o ·__ a 4-C'') 2ctC-(i) tb,c{)2.~O . \." "/, 2ac-t zbtA~ ~l-+(2+12.-+dl. --- 2q(+2b&~ I fht1'U~1M xy ,/0 ~ l "-v";70 3. <0 alt-loz-2t:tb ..,. ~, A +-.k _ i 9 ~ + b 2. 4. 4, X 2 ~fl1~tl~ - 1 J 4- cl J IX-t1/~ ~~U:>rllI''7 Ix/4'IY/ 21 12 + sx] 10 111'x tth!~1'U1'U'i)j~1\9l <"j 51 A ttlwC)5~fh ~tlU"Utl-:J rlWltlU"UtJ-:J Q = CY. 2. A [0, 00) nB = [- B - A :;:;0 4. o ~""h =l-~~ -(~4: --' I() '" 2 X =0 -3)< --9 ~ 2.- 31'= ~ -.-, '- -3"- /J .- TJ >", _ "3 B 2 . Aea 1. (-00, -1) -L_ ...{) (: .+- , ? X < [x - 71 mh A @ (-00, ~. (]) 1 x ; 21 + x :s:; t Ui'l~B ttJWC)5~rl1~tJU"UtJ~tJtYllf)1'j 4. (-00, -2) (-2,2J V (-(/7, - -I.. <I i-. --'\ c -()C-"n ~ (- ~ '!. oil) <, l. J 13111' A !ihHC}f~fil~t)1J"lJt)'lt)'fflJf)l'J '" ' ~ <: ~ ~ @ xzo 3)(..-2 ~ x.-\ -+ -- T~I~~~ @ L U [1, 00) --r i- - --A"c' 0 t; c;~.-' t -- 31<- 2. . ,(-\ ~ \JI -"' (-oO,lJ _ 2. 7,. 0 (-"""1.2.) I 1. (-2, 0) U [1,5] 3. (- %,0) z) -0<-7""P y.<'i--; ....•... ~<o (".H 7~ -I ) n B !yhn1J!9f~h!6jjflll _ '. A () '~~ ~, )(-?J 2] )(~""7 @ f -- <'0 ~ ~-z. (3) I 3) )( ')...-l Q) A. t (-i, ?71<.-t-.1..)(-':- 111'A ttJWC)5~rl1~tJU"UtJ~ 12 1 •••• , I 2 ax - C,c. 4-1 H};,< -I) 0 i -\ ~ -1 - <> + 1 2. (-00, 3) <0 2 31- )C.~1 < _1_ x (1) 00) uae B t1JWC)5~ ~.l -2. " ~, slx] (J) 0 ® 2 + + sx LL~1oUtJ1\9l ~tJlUd\!f) A ttl'Url'UtC)5~U'Vl"UtJ~ B A UB 3. ~ 12 + ax] = 2 = 2 ml1 A !ll'W«1J!C}f~"lJt)'l~fll~ (:-2, 0] U [1, 00) 4. [0,00) 3X-2-ZX41 11----- -- /j 0 (C-\ fa 1 u 11, tP) l. ';)I.-l 3;,<-Z_2I>/O // -,c-I 2. -)(-1 (-1,01 --l 3 -2-f2.)l>42.>.,0 ~)I.-' AI :: --'I~ ">/0 -~-, (-',011J (1,00) -'I -1 0 22 une fhVI'W~1t1A 14 o B tiJ'Wt9j~fh~tl1J"U~I\lfH1'lJfll'j "I'" QJ "I !:'I I QJ \9l1:IJnl~1J t9j~~'W"utlL~tlJ'W{1'lH9j\9l"uil\lB 1. {-loo, loo} 3 - X2 x + 2 - A CV {-1.8, L8} 2. {-1.7, L7} 4. {-1.8, 1.7} 2 X -:?J ~ 0 )(-+2 A I 15 2. (0, 3) U (5, 6) @ (-2, 0) U (0, 3) U (5, 6) A .. .". P,C"IJJ HI ( 0 I ;) v (~/1I ) C- 2,0 ()(-~] ~ , E · 111 a lW~ 2/ 16 -2. b ~I -I) sb 'V :: ~(-f); .. 3 + 2 4ax .........-------' - ebx + 5 (0-2 + 4 "\C_1)1 -.bbC-I) "'S+ ~ 4q +b b 2Q +'.?b 10-. -,}/o ~vi ~ Ai e ti 4. -5 UJ-(?) :: = 1'11'A L1J'WL9i\9lrl1\9leJ'IJ<)Hl~eJ"'1Jf)11 Jx 6 b e- IIVI" b::..! ') \.9 0... T-0 '7 - sx - ()l2.-3;<_~.,1_ -, t. /0 31 > IX2 + 7x - 13\ [~( +4-" -I~) (-10)( 4- 10) ('<":'1)J )(1-+2)(-9)J[-10 (X l -+ 2- J< - Z ) ( ~ -~ ) ()< 14)(~ -2-) (;(-\) <.0 L.a -.1- =.1 ,)l'UTt.H~1J'lJlf)vteJ~ 4. 7 3. 5 t= 2. U){1 b= @ ()(2.00+1/< _1'})'1. (~:z."'i.x-n) -4 ::2 1'W A ii~~1'W1'W 2. 3 -6 ID 2(.\ -+ H-1) '" "2 2 c9 ° (Xl_;,l_'nl. "" L11tH) 1>t»» 2. -3 ~.3 + 40.+610 I 17 b±,~A. I' F," rr ~ 5 6 · 7 m x + 1 1111 sx 1_ iJfhrvhil1J<Uf)1~ 1. 4 P( 9i~ sa - '4" 7<.~ v.,. d c;; 0 lu'Will'W1tH\9llJ Hl:ll ab LfYll 4 '.,. /0 23 18 111 S = {O, 1, 2, ... , 7} UCl~rll'H-r'lJ'VJf)11 a, b E S a * b = lfl'l:rvimftmnflfll'j'l1 'll't1iifJ1:J1 H-IClfllliab ~1U 6 Vhn'jllil.uf.)fl11lJ~f.)11ld ., u. {4*xlxES}={0,2,4} fl.X*l=X'VJflXES .uf.)1~~f.) 11l1111h.!'01-J 1. fl U~" 'U ~fl o. ~~ 0) ~h< rll'11'W~l11 A = {xlix ml1 A (9 ft· nB X - 11 ~ n Z j 1 I1 J 1 o 4- ~ 0 2 une 7 4 2- 4} 1~ ~ 11> UCl~B \~fll ~~ - 2 (, 1 z « 2 -t ?<.+ I 0----0 ·-+!----t-t - <: 2 -1.. A. 0-------....,0 , \ ( -\ 1 1. 1 3. l~iY )J'l(\~q \ ~'a •.•<p.at.J1Q 2 {xlx2 + 4. (0, 1] -1 c " <,3 le) = 3. (0, 1) J 2 ... J, N<1 2.0 -L '/ J. I)(tll I fl u~" 'IJ 4. z., 3/4)5 " 2. [-1,0) f -, 5 -L~ '\J ~fl f)f.)"l11-Jl~1'WGJJf.)~f.)11ld (-1,0) -1 ~ 11<1 u.i n 0) 4) ~,( l ') 16 'M1 ~ 19 1(9 fj", ;X 61~ln .....5 X::"1 \,~v ~)c1~~ 01') fl ~flU.i 'U 2. "3 ( 11 ) - 2 4 1 0 t zx < o} 24 I 21 ! 111'A tihHC})'~ftl~f)'IJ'lJf).:)f)(;'j'1Jfnlx < 1 m)l 3X 2_ 1 ~H'I'lJlfl"l.lf)'HITU1U!~1J1nflYl f)V1'U A L'Vhn'lJ'l1f)l~ '" 1. 2 3. 4 c (>;<-I)-l()<'fl~ J ~41 --=-0 - 0 4. 5 -, or-n , 0 i J 0 t I ... I ..3 y.-1> C)<+l 22 -I) J( 3i a, b !riu -'::0 N-I) ='0 CD-t@ 3+ i -a-+b e ;: -;'-ti-tlA-tb 2b: -2 nl'Yltl~llY 1. -11 ;! -(J) p(x) --' ~4-bJ 2 -@ P(l)";: 5: -:2; Q I 4 qa -3!, + 2. ...., - (- [x 1. [-3,6J - 5" f [-2,-1)U(-1,6] C)( -+!) (~')( - 1)(.+ 11 .., O'-- __ 0'---0 3) < + 11 3CA.-b,;; 10 _([) ilf)'l1f) 1~ @ (-3, -1) U (-1, 6) (-3,-1)U(-1,5) o r ~ )(L-t - <; ~ - (Z)(-,)~ s ~ ,2,,.: -7 >-CI g ~ ..t]( /-.b 4~_, CD -+@ U 1 na~ !UlHITlnU1l1'1 t11 X-I 4. 9 < 9 3 4. q b (It I ij • 1 -.1 L-_o -1 1- 0. ::: It et 30---' 2 2x 3. U~~ _(j) 2 q t\ - 7'1 h -6-1 -= ~1.. C!) 1 Cl -1 ~:: )4+4 ~Ju a + eb ijfhrvhn'lJ'l1f)l~~()ltld 2. -1 -"! - i ::'3, l~a~ a + 2 ~,,(3+X2-3f. 3(zlt(2.)1._}(2-)_1, - "\ bx b + !'vhn'lJ'l1f)1~~f)1tld =- a.-u-rJ=2 + ax + X2 - 021 -1- Ht11!'Ylflmfl''l:l 5 P( i) :: S::: f -t a 4 b + 1 19 b-C\:: Ih'l ~ I )of) t1l::f ~ P(x) a- b -'} =. /<-2P(x) ::::x3 + ax2 + 3 ~l'1fi'Yll'j PC.,;~) 3. (} = ••..l. t< -.3 -(-I) X 111P(x) ~11J X - 2. 17 ~ 23 !iJU~"'11b"~HJ'lJ"l.IU~'¥\ni'Ul'JJ P(x) = 3X !U'Ufhf)'Wrl!fI''l:l~maf)mflfl11 1. 15 feo 3 x-I ti1'Yltl~llY X + 1 !W~ I 4- )( Cl 7-3 l? = - i ::;:0 1It1~11AG) 29 , 1. .ufl1(9}~flhJ.nt1f1 trlfl 1. a ua~ b tihA'ihu1'U'il~,nr; a < b" ml1 a < b 51 a<b 3. 51 utr1 a < ab .~~. 3. f11~f)1J'Uf).Jf)fflJnTJ 1. x ~ 41 < [x + 11 ftf)'llt)1 10\ 3 0 x > '2 [x - '2 51 a <b B -A lO 2. [-2,0) U (%,3] >3 x - a < b m11 a 2 < b utr1 a 2 < b2 x - ~ til'UtC))'~ri'l~fl1J'Ut)..:)t)(1'llf11'J 2X2 - (0 [-2, 0] 0'1 x-< 0 2. 111 A til'UtC))'~f11~fl1J'Ufl":)fl(11Jf1T;) B n I 2. IC9 2 ~t) tC))'~l'W.ut)l(9} )~tllt1d 3. <3 '2 x - -2--;::: X2 x-I 5. 2. R - {-1, 1} {x1C1 + X)(3 - x) ~ o} B = CD {2} An,' utr1 A C [-1,~] (!)A C A I 3. 1 x 2. (-1,20] 2} lrJ % ua: I I 1 x-3 4. {4} .uf)1~~t)ltld\1n A C [-3, %] I ~ ° 51 4. B A C [-4, [-20, 20] 0] m:11 @[-20',..1)U{3} 4. (-1,20)U{-1} l1Cl~ Y t1J'U'll1'U1'U'il1.:J119l "1 'i)~'W'i)l'JtU1.u Ifl11ll~flluil n. 0'1 xy = f1. xy = a ~~mlJfl ~ .ut)119l ~t)ltlil .. • rvi1n1JtC]$~1wut)1(9) 1. [-20,1) 8. 51 11+ 31= 10 [-2,2] X+1 B - {x Ilx - 31 ~ 3. {3,4} 7. 111 A til'UtC))'~ri'l~fl1J'Ut).:Jt)(1'llf11'J ••• ""I 1f1f)'Uf)t(9}~tlttl'U fit).ut)l(9}~t)ltl.n 2. {2,3} 6. 111 A t1J'UtC]$~f11~f)1J'Utl~(1'llf11'J114x- 1. A = + 3 '2 Q (-00, -1) U (1, 00) 3. (-1,1) fhl1'W19l111mf)fl'l"l-fflJ'~J'VIi~tl LC]$~'Utl~~1'U1'U1 III 51 x < 4. X4 4. 111 R fit) tC))'~'Ut)":)'ll1'W1'U'il~":) tC))'~f11~fl1J'Ufl.J ffllf)l'J 1. R [o,~] 3. (-00,3] U [%,3] 4. 0 H~1 ~ ltiiifl'nll'\1lJ1!:J I d x 'U. 0'1 xy = 0 mY1 .~ ltiiifl11ll'\1lJ1V a =y \l f) \9lt)..:) 1. flf1l'il'l"ll:oUt) f) 11&'1: 'U 2. fl f1l'il'l"ll:.utl G~t) f) LtCl: fI f), 'U, fI ~19l'V.!fl.ut) 30 VU = R 9. 51Wflfl'Vfff'lJ~'Vl1i 1. [- ~ , 0) 2. (0, 00) CV (-00, - ~] 10. U (0, 00) x>"4 1. [x] 3 + 2. a > 0 x; X:f.:. <5 3 f\~ '1l{)119l @ x < 0 yi1{) 0 Ixl + b 2. 12. '1l'Clll9ll9i'ClltJ~NI9l (-00, - ~] U [0,00) 4. rh x ~'ff{)l9lfl5{)'lnU{)ff'lJfl1';I 1. ~ - 3 s ~ + 1 f\mJ{)ll9l LC}f~fl1~{)U'lH)'l{)ff .rrn W < 0 1 x >~ 4. x> lbf < 4. <~ -w< ~ 1 1 o-W 0 Uf1:: x 1 ... . mh 'l,r)'I,Hih.,l,hUl'W n 1. ,)1 'Wl'WL~ 'lJ'Vl 19l'J'J U:; 2. ')l'Wl'W~L~ u'Wl~'W'J1l'Vlfl'UU'lJJ1 LU'W,)l'W 'W~'J'Jfl U:: '" CV 'ff1'lJ1'JfI'l11')1'Wl'W~'J'JflU::~'lJlfl~~19l 4. 'ff1'lJl1f1'l11')1'Wl'WL~'lJ~U{)U~'ff19l UI9i'lJ1 nil • 13. 0'1 x = -{3 + 1 uee ylu'WatH1{)1ffa1'l15 +..f3 1. 1 LLI9i !mJnl1 ~2 V 2 1 l~lff'lJ{) 0 1~1'ff'lJ{) x fll'J~tu'IJ{)-:J 1_..f3 Ual y2 ft{)'Ii''Clll9l -{3-1 2 3. -(3+1 2 4. 2 .. 14. '1l{)m1'lJ119l19i'CllU~Ofl~'Cl-:J "0 '" 2. th Ya LU'W')l'Wl'W{)I9l'J'JflU::W:l,,) a lU 3. ill 1. 'lJ'ill'Wl'W'il1'l Q 0'1 a :f.:. 0 a:f.:. x d o~ •.• ~~ C}f'l'Vl11'l1'i x uee b ° Ha:: b :f.:. 0 1\9lt1~ :f.:. 0 u51 - 5 = -7 a <b < (a + ;)1'WTU{)~'J1fltJ:: 1 1 0 LL5") -<- a b)2 b ab 2 15. '1l'Clm1'lJ119l19i'CllU~\lfl~{)-:J 1. 0'1 CD 16. x >y > -zy U51 -2X tl1 ~ ~ 0 U"l xy ~ ° 2. tl1 x > 4. x < 0 11"1 x > Ixl tl1 -3 U51 x + 4 ::; 0 .. 'Il{)ll9ll9i'Cllll~ofl 1. LC}fI9l'IJm~l'Wl'WL~'lJnu O~'JUl oiit{) ~ KO ,ru U~il'ff'lJl~fl~l'l 2. il~1-i~~'Wn{)~ff ICJf\Ol'IJ€l'l'il1'W1'W \Ol';l';lfl uenu f)1';1tltull m flJ~ flfJ UJ Im:::ffll1')j'fl'I'J fl \Ollll€l'WI1€l';lff @ a1'l151Ji'Jfl '1 a, 4. ihh'W1'WI9l'J'JOU:: bE a R rll'l1'W\9l1-Ha * bl 11!;l::')1'W1'U'Cl~'J1flm = (~a)(2b) 191-:J«'W R t11J1{)LU{)L';Ii''W* l1-iilmmlflfJru b CM'! a + b LiJ'W')1'W1'U19l'J1fltJ:: 31 17. t11 x, Y U(l~ z tih.!~l'Ul'U'il~~ '11tlfl11lJl\9l~tl' IdiJfl = xy + ex + y) mrl x 1. fll x * Y 2. fll Y *- 0 U(l~ w 3. m .x t4) V itJ <Y [x] < ., x LWl IYI mrl -1 * y = y < ~< * x 1 x+Y < -2- < Y 1, 2 U~~ 3 tlflVlfl'11tl .. q 18. '11tll\9l~flltJd~\9l 1. fll a, b E R U(l~ (a + b)(a ® fll a, b E 2 - b) ::; 0 U 11 lal ::; Ibl 2 R+ lm~ b - a = la2 - b21 3. fll a, b, c E R n];)'1 la 4. fll a, b, c U(l~ d E R L lmJ~ d*-o U];)' X-I ::; 2 8 7 1. (-00, - 15 )U (~, 00) 20. >a b] + la - cl ;;:: ib - cl ax - ®( al b 2. (-00, - In -00, ~) U [3, 00) (-oo,~] U [3,00) 4. fllmflfl'V'l«m~J'V1lf 91 = R U];)'119$\9lr11\9lflU'U l~tltrlJfll'5' 1. (-00, -2) U (2, 00) u (~, 00) Ix31 < 8 i"ifl'11fll\9l 2. [0, 2J C9 3. (-2Y2, 2Y2~ (-2, 2) 21. '11tlfl11lJl\9l~fl'ui'1N\9l U];)'1 )::; X2 < 16 1. fll x E (-5, 4) U~~x E [-2,7) {x} C (-2, 7] LW~ {y} C (-3,5] lL61 {x - y} C (1,2] G>fll 3. fll [x + 4. fll -12 22. 41 < 2 Uf!:; Iy + 61 < 4 < x < -9 LW~ 2 nal 4 ~ xy < 60 < Y < 3 n];)'l 3 < ~ < -1 y2 fll x LW~ Y lll'U'ill'Ul'U'il~~ 'llfll\9l~flludN\9l 2. fll [x - 31 < 1 mll Ix2 - zx - 31 < 2 3. fll x + 5x - 4 ;;::1 Ua'l ex _ 2) 3 ;;:: ) X2 + 6 4. fll y2 + xy + x + 3 = 0 tll'UtrlJfll'5'yjn 11'U\9l1'11mr'l f11 x ~'Vhl'l1f11 Y'illflfflJf)1'j'vlnl'l1'U\9l1r1' lll'U~l'Ul'U'il~~ fitl x ::; -2 'Vi1tl x ;;:: 6 32 12X; 41 ;::::2 ~ 23. 1)\I'VI1L9l'~r11~{)'lJ'IJ{)\I{)~lJm'j I CV [-00, 2. [-1, 00) t9l'I9lr11I9ltlU'IJ()\ltl~lJf11':i 24. 25. 26. i] [-1, 12x 3. 12x + 11> + fl1'V1tJI9l1'11'[x 0-24 sx + 3 > + I~+ 3 - 11 < 3 LL~:: Iy + 41 < 2 -1] U [2, 00) 11 d~hHrUL9l'I9l'IJ()\lL9l'~fh~{)'lJ'IJ{)\ltJ~lJflTJll9l 2. (%f < 2- 0(X: + 4 1)(X2 + 3X + 2) > 0 <u ll9l~tlitli1f1fl101tl\l ... < xy < -12, Ix - 11 27. .J 2X2 11 < 5 1. (-00, 4. [-1, %] U [2, 00) [1, 00) U 4. fitl<Utlll9l 0 2. [-~,~] t9l'~fh~{)U'lJtl\l{)~lJm':i 3. Ixl) ~ - %,~] U [1, 00) 1. [- CV [x - 11)(x2 (X - ~l 2. 3 Iy + 41 <"2 Iy + [x - 11 - 4. -8 41 < 1 <x - y < 2 m':i~1Ull!'utJll91~tJitll1ttJ'W1)1\1 (!) {)1 [x - 41 < [x 3. {)1 Ix2 21 mll x < 3 - 91< 6 mrl -f3 < < ill X 28. 1'11'A LU'Wt9l'I9lr11I9ltJU'lJtJ\IIX + 3 X-4 nell A (] B . Z.. ()l + 2 4. <u{) 1, 2 > 0 uae B + 31 < 1 3 ~19I'\flfl'l1{) q tU'WI9l'I9lr11I9ltlU'U{)\I [x - 11 + 12x + 31 > 5 !u'W«uL9l'~'lJtJ\lt9l'19l1191 (J) (-00, 3. (0, 00) -1) U (0, 00) 4. (-00, 1] 29. 1'W!tl{1'TlJl'VI~VlJ ri1lJ1flfl':i1 uae [x 5 Ul;)l 1 1. (1,00) ABC ;Jl'W'lJtJ\I!tl~llJl'VI~V 6 ~1':il-l.n1 lUUfI11lJ~-l u\9iutJVf)'"h J~'Wfl';hri1'W\1'\I 4 .n1 t1~::vr'W~'lJtl\lltl~llJ1'V1~tllJii 16 I9l 11-l.n1 (111'11'x LU'WfI11lJVll'IJtl\l~1'W;J1'W LLm: y <u{)1191\9i{)'hJl1f1fl101fl-l ... 1. 2 < x [x - 31 < ... L7 4 < yx < 3 ~1 -y<4 2 3. 2 Y <X < 4 30. 1'11'R II'VlUL9l'I9l'UtJ\I~lU1U1)1\1 <Utlll91\9itJitldfl IlO1tl-l '" LL~:: b LUU,)lU1UI9l':i':iflV:: 1. 0'1 a 2. 0'1 a, b 3. 80'1 m., a, b, E R C E LL~:;a> R LW:: a, b, c, d E R b LL~:: c t W,)lU1Utl\9l':i':ifW:: ldb aCb - a) a<b< LL~:;0 < a 0 < <b C > U"1 a + be LUU')1'W1UtJ~':i':iflU:; (b - a)b c c ue'" I a < b U~:: ~ < d < 0 1t"1 (a - d)2 < (b - c)2 33 31. 32. 1. A =0 3. A = -Ix (-1, 2) U (2, 00) 41 + x - 35. sx - 41 :::;:M A 'il:::Lvi1nllL"Jj'~1'W'u{)119l 1 E Rllx - iI :::;:4} 4. [3, 00) U~:::z tiJWilTWl'W'il~..:J'1~"1'1Jtl1~19i l1Jt1\1f) 01 X < y ittr~ xz < yz 'H1{) xz > yz v 1 < ~(O t1J'W'il1'Wl'Wt~lJU c:; X :::;:Y U~:::n @_ 2Xy :::;: (x + y)2 2+ (x - yi 4. = @{x 3. 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