2001*2002/2001-1002*(-1001/1000)

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2001*2002/2001-1002*(-1001/1000)

2001*2002/2001-1002*(-1001/1000)
= 2002 + 1002*1001/1000
=2002 + 501*1001/500
=2002 + 501501/500
=1001000/500 +501501/500
=1502501/500

3004