Giải phương trình 1/x-1+2/x^2+x+1=3x^2/x^2-1 Cho phươg trình : 5 (m+3)(x+1)-4 (1+2x)=80 a,giải phương trình khi m=-1 b, tìm m để phươg trình cs nghiệm x=2

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