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huypham220727
2 năm trước
Tìm các số nguyên x và y biết: a) ( x^2 + 7) (x^2 - 49) < 0 b) (2x - 1) (2y + 1) = -35 c) xy - 2x + 3y = 0 d) 1/x + y/2 = 5/8
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