问题描述:
计算:[1+(-1/2)]+[1/2+(-1/3)]+[1/3+(-1/4)+…[1/1999+(-21/2000)]
A 2000/1999 B 1999/2000 C 1/2000 D 1/1999
sorry,错了,是[1+(-1/2)]+[1/2+(-1/3)]+[1/3+(-1/4)+…+[1/1999+(-1/2000)]
A 2000/1999 B 1999/2000 C 1/2000 D 1/1999
sorry,错了,是[1+(-1/2)]+[1/2+(-1/3)]+[1/3+(-1/4)+…+[1/1999+(-1/2000)]
问题解答:
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