x-1/x=4.8x^2-1=4.8xx^2-4.8x-1=0(x+0.2)(x-5)=0x1=-0.2，x2=5
由题意得x不为0等式两边同乘xx2-1=4.8xx2-4.8x-1=0(x-5)(x+0.2)=0x1=5;x2=-0.2两个解
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