问题描述:
1/2×4+1/3×5+.1/(n+1)(n+3)等于?1+2/3+3/3².+n/3的n-1次方 等于?
1+1/1+2+1/1+2+3.+1/1+2+3..+1/1+2+3..+n 等于?
1+1/1+2+1/1+2+3.+1/1+2+3..+1/1+2+3..+n 等于?
问题解答:
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