2002 ^ 2 divided by 1999 * 2001-1 2002 ^ 2 (the second power of 2002) ——————(fractional line) 1999*2001-1 Using the square difference formula to solve the problem

1999*2001-3=(2000-1)(2000+1）-3
=2000^2-1-3
=2000^2-4
=（2000+2)（2000-2）
2002^2=（2000+2）^2
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