若1- 2/x + 1/x² =0,那么1/x³的值是( )A.-1/8 B.1/8 C.-1 D.1
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若1- 2/x + 1/x² =0,那么1/x³的值是( )A.-1/8 B.1/8 C.-1 D.1
若1- 2/x + 1/x² =0,那么1/x³的值是( )A.-1/8 B.1/8 C.-1 D.1
若1- 2/x + 1/x² =0,那么1/x³的值是( )A.-1/8 B.1/8 C.-1 D.1
D
解析:通分得:(x2-2x+1)/x2=0,则(x-1)2=0,x=1.故,1/x3=1
选D
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