分母是1,2,3…n
分子是1×1+1,2×2-1,3×3+1…n×n+(-1)的(n-1)次方
找规律1/2 -2/3 3/10 -4/15 5/26 -6/35
找规律1/2 -2/3 3/10 -4/15 5/26 -6/35
1/2 ,-2/3 ,3/10 ,-4/15 ,5/26 ,-6/35 ,( ) ,( )
1/2 ,-2/3 ,3/10 ,-4/15 ,5/26 ,-6/35 ,( ) ,( )
数学人气:846 ℃时间:2020-03-26 14:23:43
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