Cho hệ phương trình x-2y=3-m và 2x+y=3(m+2)a) Giải hệ phương trình khi m = -1. b) Tìm m để hệ có nghiệm duy nhất (x ; y) sao cho S = x2 + y2 đạt giá trị nhỏ nhất

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