n(n+2)分之1 n(n+k)分之1 等于多少

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n(n+2)分之1n(n+k)分之1等于多少n(n+2)分之1n(n+k)分之1等于多少n(n+2)分之1n(n+k)分之1等于多少n(n+2)分之1=1/2*(1/N-1/(N+2))n(n+k)分

n(n+2)分之1 n(n+k)分之1 等于多少
n(n+2)分之1 n(n+k)分之1 等于多少

n(n+2)分之1 n(n+k)分之1 等于多少
n(n+2)分之1 =1/2*(1/N - 1/(N+2) ) n(n+k)分之1 =1/K*(1/N - 1/(N+K) )