ࡱ> IKHSq` J%bjbjqPqP 0~::zzzzzzz8*4^,6,jb"+++++++$-h0~+z+zz+O+O+O+ zz+O++O+O+zzO+  ]$#O++ ,06,O+0$p0[+0zi+@O+++*X6,dzzzzzz Phng trnh -bt phng trnh v t Dng 1: S dng cc php bin i tng ng Bi1: Gii cc phng trnh v bt phng trnh sau 1/ EMBED Equation.3 - EMBED Equation.3  = EMBED Equation.3  3/ EMBED Equation.3  2/ EMBED Equation.3 - EMBED Equation.3  = EMBED Equation.3  4/ EMBED Equation.3  (HXD-99) Bi2: Gii cc phng trnh v bt phng trnh sau 1/ EMBED Equation.3  4/ EMBED Equation.3  2// EMBED Equation.3  5/ EMBED Equation.3  3/ EMBED Equation.3  HD:Cc bi trn a v cc hng ng thc Dng 2: a v PT hay HPT i s bng php t n s ph Bi3: Gii cc phng trnh v bt phng trnh sau 1/ 3 EMBED Equation.3  3/ 3 EMBED Equation.3  2/  EMBED Equation.3  4/(4x-1) EMBED Equation.3  5/ 2(1-x) ) EMBED Equation.3  HD: Cc phn 1,2,3 t n ph hon ton .Cc phn 4,5 t n ph khng hon ton hoc a v dng hng ng thc 2/t X= EMBED Equation.3  a v pt hoc t  EMBED Equation.3  a v h pt 3/t X= EMBED Equation.3  4/t X= EMBED Equation.3  i bin khng hon ton. 5//t X= EMBED Equation.3  i bin khng hon ton.Hoc a v hng ng thc Bi 4:Gii cc phng trnh sau 1/ EMBED Equation.3  4/ 1+ EMBED Equation.3  2/ x3+1=2 EMBED Equation.3  5/ x+ EMBED Equation.3  3/  EMBED Equation.3  6/ x EMBED Equation.3 (x+ EMBED Equation.3 )=30 HD:1/ t  EMBED Equation.3  a v h hoc chuyn v v bin i tng ng 2/ t y= EMBED Equation.3  a v h i xng loi II 3/t X= EMBED Equation.3  4/Hon ton tng t c th a v pt hoc h pt 5/t y= EMBED Equation.3  a v h PT i xng loi I 6/ Hon ton tng t Bi5: Gii cc phng trnh v bt phng trnh sau 1/  EMBED Equation.3  4/ EMBED Equation.3  2/ EMBED Equation.3  5/  EMBED Equation.3  3/ EMBED Equation.3  HD: Cc phn 1,3,4 nn a v gii pt tm nghim v xt du cui cng l chn du thch hp vi du ca BPT. Song hu ht hc sinh qun rng biu thc c i du qua cc gi tr khng xc nh Bi5: Gii cc phng trnh v bt phng trnh sau 1/ x2+ EMBED Equation.3  =31 4/ EMBED Equation.3 (1)(HAN-99) 2/  EMBED Equation.3  5/ EMBED Equation.3  3/ x2+ EMBED Equation.3  =5 6/  EMBED Equation.3  HD: 1/ L loi n gin 2,3/ a v h 4/t  EMBED Equation.3  Th (1) tr thnh U+V+2UV+U2+V2-180<0  EMBED Equation.3 (U+V)2+(U+V)-180 <0 v a v gii BPT c bn 5/ HD: / EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3  tU= EMBED Equation.3  V= EMBED Equation.3  PT cho tr thnh 2V2+3U2=5UV (PT ng cp vi U v V) Gii ra ta c U=V hoc 2U=3V ....KQ:x=8; x= EMBED Equation.3  6/t  EMBED Equation.3  Ta c h EMBED Equation.3 gii h KQ: x=1;x=-6 Bi8:(Dng c th nhn chia vi biu thc lin hp) Gii cc phng trnh v bt phng trnh sau 1/ EMBED Equation.3  2/ EMBED Equation.3  3/(HM-99)  EMBED Equation.3  4/ EMBED Equation.3  HD:Tt c cc pt bt phng trnh trn u c th thc hin nhn chia vi biu thc lin hp . Vi 2 phng trnh u c/m nghim duy nht Bi9: Gii cc phng trnh v bt phng trnh sau ( Dng a v h phng trnh i xng loi II) 1/x2+2= EMBED Equation.3  HD :t EMBED Equation.3 =y 2/ 2 EMBED Equation.3 =x2-2x HD :t EMBED Equation.3 =y-1 3/2x2+4x= EMBED Equation.3  HD :t EMBED Equation.3 =y+1 5/ 2x2-6x-1= EMBED Equation.3  HD :t  EMBED Equation.3 =y-3/2 6/ x2+4x+5= EMBED Equation.3  HD :t EMBED Equation.3 =y+2 7/ -4x2+13x-5= EMBED Equation.3  HD :t EMBED Equation.3 =-2y+3 Bi 10:(S dng cc php bin i khng thun nghch  EMBED Equation.3  Nu A,B EMBED Equation.3 0  EMBED Equation.3  Nu A,B EMBED Equation.3 0) 1/ EMBED Equation.3  2/ EMBED Equation.3  3/ EMBED Equation.3  4/ EMBED Equation.3  5/ EMBED Equation.3  6// EMBED Equation.3 (HD: Do v tri dng nn v phi phi dng do iu kin x EMBED Equation.3 -1 v x=-1 l mt nghim rt gn a v pt n gin..... KQ: Cc nghim x=-1 ;x=1  EMBED Equation.3  Bi11: (Mt s phng php c bit khc) 1/  EMBED Equation.3  2/ EMBED Equation.3  3/ EMBED Equation.3  4/ EMBED Equation.3  HD: 1/ t iu kin x EMBED Equation.3  EMBED Equation.3  vit li pt di dng  EMBED Equation.3  suy ra  EMBED Equation.3  EMBED Equation.3 4x-1 EMBED Equation.3  EMBED Equation.3  t iu kin suy ra pt c mt nghim duy nht x=1/2 2/ V tri nh gi nh bt ng thc Bu-Nhi-A  EMBED Equation.3 VT EMBED Equation.3 2; v phi vit li di dng hng ng thc suy raVP  EMBED Equation.3 2 a n h ...suy ra x=3 l nghim duy nht ca pt 3/ p dng bt ng thc Bu-Nhi-A cho hai b s (x;1) v ( EMBED Equation.3 ) t iu kin du bng xy ra ta c nghim ca pt x=1;x=1+ EMBED Equation.3  Bi 13: 1/ 2(x2+2)=5 EMBED Equation.3  2/ 2(x2-3x+2)=3 EMBED Equation.3  3/  EMBED Equation.3  4/3( EMBED Equation.3 ) 5/ 2x3-x2+ EMBED Equation.3  Bi14: Tm m phng trnh ,h phng trnh c nghim duy nht 1/ EMBED Equation.3  2/ EMBED Equation.3 =m 3/  EMBED Equation.3  4/ 2m EMBED Equation.3  5/ EMBED Equation.3  6/ EMBED Equation.3  Bi 15: Tm m phng trnh sau nghim ng vi mi x EMBED Equation.3 0  EMBED Equation.3  Bi 16:Tm m cc phng trnh h phng trnh sau c nghim 1/ EMBED Equation.3  2/ EMBED Equation.3  Bi17:Gii v bin lunpt EMBED Equation.DSMT4   EMBED Equation.3      Nguyn Th Ngc Minh GVton THPT Chuyn Lo Cai PAGE  PAGE 4 Gi tng cc em n thi i hc -Chc cc em thnh cng %'./Vt_G.jdE hU,h$UCJUVaJmHnHu)j:hU,h$UCJEHOJQJUaJ.jdE hU,h$UCJUVaJmHnHu)jhU,h$UCJEHOJQJUaJ.jdE hU,h$UCJUVaJmHnHu%jhU,h$UCJOJQJUaJ"hU,h$U56CJOJQJaJhU,h$UCJOJQJaJhU,h$UCJOJQJaJh$U%U  ^ ' z ? u T Os$I%      + , - . / 0 C D E F H I \ ȰȃnVA)j hU,h$UCJEHOJQJUaJ.jBeE hU,h$UCJUVaJmHnHu)ja hU,h$UCJEHOJQJUaJ.j(eE hU,h$UCJUVaJmHnHu)jhU,h$UCJEHOJQJUaJ.jeE hU,h$UCJUVaJmHnHuhU,h$UCJOJQJaJ%jhU,h$UCJOJQJUaJ)jthU,h$UCJEHOJQJUaJ\ ] ^ _ l m   lW?.jhE hU,h$UCJUVaJmHnHu)jhU,h$UCJEHOJQJUaJ.jVfE hU,h$UCJUVaJmHnHu)jhU,h$UCJEHOJQJUaJ.jeE hU,h$UCJUVaJmHnHuhU,h$UCJOJQJaJ%jhU,h$UCJOJQJUaJ)j hU,h$UCJEHOJQJUaJ.jWeE hU,h$UCJUVaJmHnHu    3 4 5 6 F G Z [ \ ] l m ȰȃnVA)jhU,h$UCJEHOJQJUaJ.jgE hU,h$UCJUVaJmHnHu)j-hU,h$UCJEHOJQJUaJ.jqhE hU,h$UCJUVaJmHnHu)j4hU,h$UCJEHOJQJUaJ.jfE hU,h$UCJUVaJmHnHuhU,h$UCJOJQJaJ%jhU,h$UCJOJQJUaJ)jhU,h$UCJEHOJQJUaJ 7 8 K L M N b c v w x y ▁iT<.jiE hU,h$UCJUVaJmHnHu)j-#hU,h$UCJEHOJQJUaJ.j/jE hU,h$UCJUVaJmHnHu)j hU,h$UCJEHOJQJUaJ.jiE hU,h$UCJUVaJmHnHu%jhU,h$UCJOJQJUaJ"hU,h$U56CJOJQJaJhU,h$UCJOJQJaJhU,h$UCJOJQJaJhU,h]=CJOJQJaJ ȰȃnVA)j-hU,h$UCJEHOJQJUaJ.jE hU,h$UCJUVaJmHnHu)j9+hU,h$UCJEHOJQJUaJ.j kE hU,h$UCJUVaJmHnHu)j(hU,h$UCJEHOJQJUaJ.jjE hU,h$UCJUVaJmHnHuhU,h$UCJOJQJaJ%jhU,h$UCJOJQJUaJ)j%hU,h$UCJEHOJQJUaJ  ! 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