在直角坐标系中,设一质点M自P0(1,0)处向上运动1个单位至P1(1,1),然后向左运动2个单位至P2处……

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  • (1)X1=1,X2=-1,X3=-1,X4=3,X5=3,X6=-3

    (2)X1+X2+…+X8

    =1-1-1+3+3-3-3+5

    =4

    (3)X1+X2+…+X2003+X2004

    =1-1-1+3+3-3-3+5+5-5-5+.+1001+1001-1001-1001+1003

    =1002