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 1/1999sorry,错了,是[1+(-1/2)]+[1/2+(-1/3)]+[1/3+(-1/4)+…+[1/1999+(-1/2000)]

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计算:[1+(-1/2)]+[1/2+(-1/3)]+[1/3+(-1/4)+…[1/1999+(-21/2000)]A2000/1999B1999/2000C1/2000D1/1999sorry,错

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 1/1999sorry,错了,是[1+(-1/2)]+[1/2+(-1/3)]+[1/3+(-1/4)+…+[1/1999+(-1/2000)]
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)]

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 1/1999sorry,错了,是[1+(-1/2)]+[1/2+(-1/3)]+[1/3+(-1/4)+…+[1/1999+(-1/2000)]
:[1+(-1/2)]+[1/2+(-1/3)]+[1/3+(-1/4)+…[1/1999+(-21/2000)]
=1-1/2+1/2-1/3+1/3-1/4+.+1/1999-1/2000
=1-1/2000
=1999/2000
选B