D
dragonknight_death


Tim x, y nguyen thoa man:
[FONT=.VnTime][FONT=.VnTime]a)[/FONT] [/FONT][FONT=.VnTime][tex]x^2+xy+y^2 = 3(x+y-1)[/tex][/FONT]
[FONT=.VnTime][FONT=.VnTime]b)[/FONT] [/FONT][FONT=.VnTime][tex]5x^2+2y^2+4xy+4y-8x+14 = 0[/tex][/FONT]
[FONT=.VnTime] c) [tex]5x^2+10y^2+3-12xy+8y-2x = 0[/tex][/FONT]
[FONT=.VnTime] thank truoc nha
>- o-+ =((
[/FONT]
[FONT=.VnTime][FONT=.VnTime]a)[/FONT] [/FONT][FONT=.VnTime][tex]x^2+xy+y^2 = 3(x+y-1)[/tex][/FONT]
[FONT=.VnTime][FONT=.VnTime]b)[/FONT] [/FONT][FONT=.VnTime][tex]5x^2+2y^2+4xy+4y-8x+14 = 0[/tex][/FONT]
[FONT=.VnTime] c) [tex]5x^2+10y^2+3-12xy+8y-2x = 0[/tex][/FONT]
[FONT=.VnTime] thank truoc nha
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