[toán 6] tìm x, y

W

williamvictor

[tex]\ (x+1) ^ 2 + (y+1)^2 = 0 [/tex]
[tex]\Leftrightarrow x+1 =0 ; y+1 = 0 [/tex]
[tex]\Leftrightarrow x=y=-1 [/tex]
 
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