Phuongtrinh duongtron

 ( ; ) A A A x y ( ; ) B B B x y   !"#$%&'%()*  0 0 ( ; )M x y #&(  2 2 ( ) ( ) B A B A x x y y − + − ! +,!"(  0 0 2 2 Ax By C A B + + +  ( ; )M x y 2 2 ( 1) ( 2) 4x y − + − = -./  "0  -) 12/ 3456      # & 7 89:5;2< 89:5;2<89:5;2<=:5;=< 7 >?@?7A  ( ; )M x y (1;2)I ⇔ 345 "  +?  B34C-  +BDEFG?- $            y 3  G    -   1H'I2/+  M -   ⇔ J@DKADEF ⇔ 2 2 ( 1) ( 2) 4x y − + − = ( ; )M x y (1;2)I ⇔ 345 "  +?  B34C-  +BDEFG?- $            y 3  G    -   1H'I2/+  M -   3DEF " ?8,I DL6D$,'0 MN+ $O'"B " * 0 ( ; ) o I x y 3? 2 2 0 0 ( ) ( )x x y y R− + − = 3DEF " 0 x 0 y PQ$' P &?8 PA606$,'0 MN+ $O'"B " $   3  G + y 0 0 ( ; )I x y RE4 ⇔ + $O'"B " G+(8 ⇔ 2 2 2 0 0 ( ) ( )x x y y R− + − = 0 0 ( ; )I x y J@DKADEF PQ$' DEF (C) T©m ?8I@0 2 2 2 0 0 ( ) ( )x x y y R − + − = ⇔ SKF DL$?T 3: B 171@DEF ,PG UO-"?V ,DE#&W# O-", & VOU-" X4 X4X4 SDEFG UO-" &?V0 2 2 ( 1) ( 2) 9x y + + − = 0 0 ( ; )I x y PQ$' DEF  " P ?8I@0 2 2 2 0 0 ( ) ( )x x y y R − + − = J@DKADEF >F#&IG0 #&?8(#&J-< 1W# O-",& VOU-"AG -O)" 1H'@DEF#&0 2 2 1 (3 1) ( 2 2) 5 2 R = − + − − = 2 2 ( 2) 5x y − + = 0 0 ( ; )I x y PQ$' DEF  " P ?8I@0 2 2 2 0 0 ( ) ( )x x y y R − + − = -JH!:@DEF J@DKADEF H'YFZI@!: " 2 2 2 2 0(2)x y ax by c + + + + = 2 2 0 2 2 2 0 0 (1) 2 2 0 o x y x x y y x y R ⇔ + − − + + − = DL0:Y@!: -"W ,,[\I@40@N BDEF* H$] + $O'"345 -" +?G UOU"B 34C  ⇔ ⇔ 2 2 2 2 ( ) ( )x a y b a b c + + + = + − 2 2 a b c + − P9' -" 0@DEF G UOU"? 2 2 0a b c + − > 2 2 R a b c = + − 2 2 2 2 0x y ax by c + + + + = @DKA W 0 0 ( ; )I x y PQ$' DEF  " P ?8I@0 2 2 2 0 0 ( ) ( )x x y y R − + − = -JH!:@DEF " @DKA W 0@DEF G UOU"? 2 2 0a b c + − > 2 2 R a b c = + − 2 2 2 2 0x y ax by c + + + + = J@DKADEF -" 17?Z2='2 0@DEF 0@DEF 0@DEF 2 2 , 2 4 1 0a x y x y + − + − = 2 2 , 2 2 4 2 0b x y x y + − + − = 2 2 , 2 4 6 0c x y x y + − + + = 2 2 , 2 2 2 4 2 0d x y x y + − + + = 0@DEF sai®óng 89:5;2< ®óng §óNG .#G 89:5;2< .#G §óNG .#G 89:5;2< .#G §óNG .#G 89:5;2< .#G 0 0 ( ; )I x y PQ$' DEF  " P ?8I@0 2 2 2 0 0 ( ) ( )x x y y R − + − = -JH!:@DEF @DKA W 0@DEF G UOU"? 2 2 0a b c + − > 2 2 R a b c = + − 2 2 2 2 0x y ax by c + + + + = J@DKADEF " -" 171@KF^ V+ O-", _O-",S OUV" X4X42`KFI@ 0 2 2 2 2 0x y ax by c + + + + = 2 2 0a b c + − > !3+,,SBKF I@ 5 2 4 0 29 10 4 0 10 2 6 0 a b c a b c a b c + + + =   + + + =   + − + =  ,,345< 1H'@DEF0 2 2 6 1 0x y x y + − + − = 3 1/ 2 1 a b c = −   ⇔ =   = −  ®éi 2 ®éi 1 # 7 &  a # 7 &  a 3 " b !"$%'%() PGN "0 &N "0 ! 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"0’ ’ SFG @$=W’ ! 0’ SDEFG c! ’ ’ :# ,& 233# & (8 0’ ’ ’ ’ ’  04:0003:5903 :5803 :5703:5603:5503 :5403 :5303:5203:5103:5003:4903 :4803:4703:4603 :4503 :4403:4303:4203:4103:4003:3903:3803:370 3:3 603 :3503 :3403:3303:3203:3103:3003 :2903:2803:2703:2603:2503:240 3:2303:2203:2103:2003:1903:1803:1703:1603:1503:1403:1303:1203:1103:1003:0903:0803 :0703:0603:0503 :0403 :0303:0203:0103:0002:590 2:5802:5702:560 2:550 2:5402:5302:5202:5102:5002:4902:4802:4702:4602:4502:4402:4302:4202:4102:4002:3902:3802:3702:3602:350 2:340 2:3302:3202:3102:3002:2902:2802:270 2:2602:2502:2402:2302:2202:2102:2002:1902:1802:1702:1602:1502:1402:1302:1202:1102:1002:0902:080 2:0702:0602:0502:0402:0302:0202:0102:0001:5901:5801:5701:5601:5501:5401:5301:5201:5101:5001:4901:4801:4701:4 601:4501:4401:4301:4201:4101:4001:3901:3801:3701:3601:3501:3401:3301:3201:3101:3001:2901:2801:270 1:2601:2501:2401:2301:2201:2101:2001:1901:1801:1701:1601:1501:1401:1301:1201:1101:1001:0901:0801:0701:0601:0501:0401:0301:0201:0101:0000:5900:5800:5700:5600 :5500 :5400:5300:5200:5100:5000:4 900:4800:470 0:4 600:4500:4400:430 0:4 200:4100:4000:3900:3800:370 0:3 600:3500:3400:330 0:3 200:3100:3000 :290 0:2800:2700 :2600:250 0:2400:2300 :2200:2100:2000:1900:1800:1700:1600:1500:1400:1300:1200:1100:1000:0900 :0800 :0700:0600:0500 :0400 :0300:0200:0100:00 hÕt giê 2 2 ( 2) ( 3) 5x y − + + = 2 2 ( 1) ( 2) 2x y + + − = I(-1;2) I (2;-3)’ R = 3 R = 2’ 5 2 2 2 ( 1) ( 2) 17 / 4x y + + − = 2 2 ( 1) ( 2) 6x y + + − =