-1+3-5+7.-2005等于几
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-1+3-5+7.-2005等于几
-1+3-5+7.-2005
= [-1+3]+[-5+7]+[-9+11].+[-2001+2003]-2005
= 2*1002/2-2005
= -1003
原式=2×1003-1003=1003
-1+501*(-2)=-1003
-1+3-5+7.-2005等于几
-1+3-5+7.-2005
= [-1+3]+[-5+7]+[-9+11].+[-2001+2003]-2005
= 2*1002/2-2005
= -1003
原式=2×1003-1003=1003
-1+501*(-2)=-1003