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3道初二的分式方程题!1.已知分式方程(4x/x-2) -5 = (m/2-x)无解,求m的值?2.已知x^2 + 3x +1 =0,求x^2 +(1/x^2)的值3.化简 (2b^2/a+b) -b+a

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