(xy)²-3xy-102.x²-y²+y-¼3.已知x²-5x-1=0,求x-(x分之一),x²+(x²分之一)的值4.填空:1x2x3x4+1=( )²; 2x3x4x5+1=( )² 11x12x13x14+1=( )²
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