PT qui về PT bậc 2(Hay)

Ph¬ng tr×nh qui vÒ ph¬ng tr×nh bËc hai   Bµi 1. Gi¶i c¸c ph¬ng tr×nh sau: a) 056 =+− xx b) 0752 =++− xx c) 098 =−+− xx d) 9 20 1 20 =+ − xx e) ( )( ) xxx 2112 −=−+ f) 03613 24 =+− xx g) 0169 24 =++ xx h) 0352 24 =+− xx i) 065 24 =++− xx j) 15 5 100 5 100 = − + + xx k) 2 2 2 2 2 = + + + x x x x l) 1 12 2 1 2 1 + + = − − + + + x x x x x x Bµi 2. Gi¶i c¸c ph¬ng tr×nh sau: a) 01 235 =+−− xxx b) 0673676 234 =+−−+ xxxx c) 02772 23 =+++ xxx d) 0188 23 =+−− xxx e) 04 23 =++ xx g) 0485 23 =−+− xxx Bµi 3. Gi¶i c¸c ph¬ng tr×nh sau: a) ( )( )( ) 01321 =++++ xxxx b) ( ) ( ) ( ) ( ) 2 3 7 8 144x x x x+ + − − = c) ( )( )( )( ) 2977531 =++−− xxxx d) ( )( )( )( ) 1086321 =+++− xxxx e) ( )( )( )( ) 207531 =−−−− xxxx f) ( )( )( )( ) 412311214 =++−+ xxxx g) ( ) ( )( ) 3512356 2 =+++ xxx h) ( ) ( )( ) 31223712 2 =+++ xxx i) ( ) ( )( ) 1832121 2 =+++ xxx j) ( ) ( ) ( ) ( ) 2 4 5 8 10 72x x x x x− − − − = k) ( ) ( ) ( ) ( ) 2 10 12 15 18 2x x x x x+ + + + = Bµi 4. Gi¶i c¸c ph¬ng tr×nh sau: a) ( ) ( ) 253 44 =+++ xx b) ( ) ( ) 8231 44 =−++ xx c) ( ) ( ) 8262 44 =−+− xx d) ( ) ( ) 6442 44 =−+− xx Bµi 5. Gi¶i c¸c ph¬ng tr×nh sau: a) 01102610 234 =+−+− xxxx b) 01464 234 =+−−− xxxx c) 0122 234 =+−−+ xxxx d) 046143 234 =+−−+ xxxx e) 4 3 2 4 9 8 4 0x x x x− − + + = f) 4 3 2 5 10 15 9 0x x x x+ + + + = Bµi 6. Gi¶i c¸c ph¬ng tr×nh sau: a) 04 5 35 2 2 =+ −+ + −+ xx x x xx b) 5 5 7 2 2 = −+ −+ xx xx c) 064 104 21 2 2 =−+− +− xx xx d) 2 2 4 2 4x x x x   + = −  ÷   e) ( ) ( ) 253 44 =+++ xx Bµi 7. Gi¶i c¸c hÖ ph¬ng tr×nh sau:    =−− =++ 3 1 . 22 xyyx yxyx a    =+ =+ 10 58 . 22 yx yx b    −=+ =+− 2 13 . 22 yx yxyx c    =++ =++ 2 4 . 22 xyyx yxyx d Bµi 8. Gi¶i c¸c hÖ ph¬ng tr×nh sau: 2 2 2 2 2 3 2 . 2 3 2 x y y a y x x − = −   − = −         =− =− y x xy x y yx b 43 43 .    +=− +=− xyxy yxyx c 22 22 . 22 22    =+ =+ yxyy xxyx d 32 32 . 2 2 . Ph¬ng tr×nh qui vÒ ph¬ng tr×nh bËc hai   Bµi 1. Gi¶i c¸c ph¬ng tr×nh sau: a) 056 =+− xx b) 0752 =++− xx c)