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teo8xqb

eu ta thay : 4x^2 +2xy+ y^2 =+1
=(x+y)^2+3X^2+1 ma (x+y)^2va 3x^2 luon lon hon hoac bang 0 ma no cong them 1 thi no se lon ho hoac bang 1 nen fuong trinh ni vo ngiem
thi chi giai :2x-y=0 thoi
e co chi hay thi nhan toi so 01684852027
 
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