1-(1+2)+(1+2+3)-(1+2+3+4)+.-(1+2+.+98)+(1+2+.99)=求正解
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1-(1+2)+(1+2+3)-(1+2+3+4)+.-(1+2+.+98)+(1+2+.99)=求正解
1-(1+2)+(1+2+3)-(1+2+3+4)+.-(1+2+.+98)+(1+2+.99)=求正解
1-(1+2)+(1+2+3)-(1+2+3+4)+.-(1+2+.+98)+(1+2+.99)=求正解
5000
原式=1-1-2+1+2+3-1-2-3-4+....-1-2-.....-98+1+2+....+99=0
原式=1-1-2+1+2+3-1-2-3=0
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