一道数学难题(简算)1998×(1/11-1/2009)+11×(1/1998-1/2009)-2009×(1/11+1/1998)+3
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一道数学难题(简算)1998×(1/11-1/2009)+11×(1/1998-1/2009)-2009×(1/11+1/1998)+3
一道数学难题(简算)
1998×(1/11-1/2009)+11×(1/1998-1/2009)-2009×(1/11+1/1998)+3
一道数学难题(简算)1998×(1/11-1/2009)+11×(1/1998-1/2009)-2009×(1/11+1/1998)+3
998×(1/11-1/2009)+11×(1/1998-1/2009)-2009×(1/11+1/1998)+3
=(1998/11)-(1998/2009)+(11/1998)-(11/2009)-(2009/11)-(2009/1998)+3
= (-11/11)-(1998/1998)-(2009/2009)+3
=0