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(1998²-2004)(1998²+3993)×1999/(1995×1997×2000×2001)
解:设x=1998
(1998²-2004)(1998²+3993)×1999/(1995×1997×2000×2001)
=(x²-x-6)(x²+2x-3)×(x+1)/[(x-3)(x-1)(x+2)(x+3)]
=(x+2)(x-3)(x+3)(x-1)×(x+1)/[(x-3)(x-1)(x+2)(x+3)]
=x+1
=1998+1
=1999
解:设x=1998
(1998²-2004)(1998²+3993)×1999/(1995×1997×2000×2001)
=(x²-x-6)(x²+2x-3)×(x+1)/[(x-3)(x-1)(x+2)(x+3)]
=(x+2)(x-3)(x+3)(x-1)×(x+1)/[(x-3)(x-1)(x+2)(x+3)]
=x+1
=1998+1
=1999
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