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x²+4x-1=0x=0不是方程的根所以等号左右同除x得x+4-1/x=0x-1/x=-4两边平方得x²-2+1/x²=16x²+1/x²=14(1)x的2次方+x的-2次方=x²+1/x²=14(2)x²+1/x²...
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