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cã 2 nghiÖm ph©n biÖt cã nghiÖm.[r]
(1)Bµi tËp ph¬ng tr×nh - bÊt ph¬ng tr×nh v« tØ Gi¶i c¸c ph¬ng tr×nh sau: 1, x x 3 2, x 5 x 3, x x x 2 4, ( x 3) 10 x x x 12 3 5, x x 1 3 6, x x x 7, x x x 4(khèiD 2005) x 2 x 8, x x 2( BCVT 2000) 9, 3(2 x 2) 2 x x 6( HVKTQS 01) 2 10, x x x 2 x 2( BK 2000) 5 x2 x2 x x x 1( PCCC 2001) 11, 12, x ( x 1) x ( x 2) 2 x ( SP2 2000 A ) Tìm m để phơng trình : 14, x mx 2 x 1( KhèiB 2006) 15, x mx 3 x( SPKT TPHCM ) cã nghiÖm ph©n biÖt cã nghiÖm 16, x mx x m( GT 98) cã nghiÖm Gi¶i c¸c ph¬ng tr×nh sau : 2 17, x x 11 31 2 19, x x x x 3( TM 98) 21, x x 3 x x x x2 18, ( x 5)(2 x ) 3 x x 20, x x 7 x 22, x x 1(NT 99) 2 24, x x 2 x x ( M § C 2001) 25, x x x x 11 26, x x x x 0(GTVT TPHCM 01) 27, x x 4 x x x 2( HVKTQS 97) x2 7x 4 x ( DL §«ng §« 2000) 28, x 2x 1 3 2( GT 95) 29, x 2 x (2) x 30, x 2 x2 31, x x (1 x ) 2 32, (4 x 1) x 2 x x 1(§ Ò 78) 33, x x ( x 3) x 1( GT 01) 2 34, 2(1 x ) x x x x 35, x x 1( XD 98) 36, x 1 x 1( TCKT 2000) 7 x 3 x 38, x x 6 x (C § KiÓmS ¸t ) 37, x x 1( LuËt 96) 3 39, x 2 x Gi¶i c¸c bÊt ph¬ng tr×nh sau : 1, ( x 1)(4 x ) x 2( M § C 2000) 3, x x x ( AN 97) 2 5, ( x 3) x x 9(§ Ò 11) x2 7, (1 x 1) 2, x x 4( BK 99) 4, x x x ( TL 2000) x2 3(NN 98) x 6, x 4( SPVinh 01) 8, 12 x x 12 x x ( HuÕ 99) x 11 2x 2 9, x x x x x x 7( BK 2000) 2 10, x x x x x 1( KT 2001) 2 11, x 10 x 7 x x (§ Ò 135) 12, (4 x )(2 x ) x x 12(§ Ò 149) 13, ( x 1) ( x 1) x x 0( XD 99) x 14, x 2x 7( Th¸iNguy ª n 2000) 2x 2 15, x ( x 4) x x ( x 2) 2( HVNH 99) (3)