2000²-4000*1999+1999²怎样简便 2000²-4000*1999+1999²怎样简便
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2000²-4000*1999+1999²怎样简便 2000²-4000*1999+1999²怎样简便
2000²-4000*1999+1999²怎样简便
2000²-4000*1999+1999²怎样简便
2000²-4000*1999+1999²怎样简便 2000²-4000*1999+1999²怎样简便
2000*2000-(2000+2000)*1999+1999*1999
=2000*2000-2000*1999-2000*1999+1999*1999
=2000*(2000-1999)-(2000-1999)*1999
=2000-1999
=1