(-1)+2+(-3)+4+(-5)+.+(-99)+1001-2+3-4+5-6+.+2003-2004如果正确的话,
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(-1)+2+(-3)+4+(-5)+.+(-99)+1001-2+3-4+5-6+.+2003-2004如果正确的话,
(-1)+2+(-3)+4+(-5)+.+(-99)+100
1-2+3-4+5-6+.+2003-2004
如果正确的话,
(-1)+2+(-3)+4+(-5)+.+(-99)+1001-2+3-4+5-6+.+2003-2004如果正确的话,
1.原式=1*50=50(两个数为1组)
2.原式=1002*-1=-1002,同理
-1+2=1 -3+4=1 .......-99+100=1 一共100/2组 所以[100/2]*1=50