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Giải hệ pt a, xy+x-2=0 2x³-x²y+x²+y²-2xy-y=0 b, x²y+x²+2y-22=0 x⁴-4x²+y²-6y+9=0 x/( x²+1) + y/( y²+1) =-¼ Giúp em vs ạ😢😢😢
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