每天吃红豆能减肥吗:"1^n+2^n+3^n......+m^n=?
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"1^n+2^n+3^n......+m^n=?
1^n+2^n+3^n......+m^n=
x=n*(n+1)*(n+2)*(n+3).......
n/(n-2)+n/(n-3)+n/(n-4)+n/(n-5)+...+2/(-1)=?
1*n+2(n-1)+3*(n-2)+......+(n-1)*2+1*n
若f(n)=(n+1)(n+2)(n+3)+……(n+n),求f(n+1)/f(n)
求和:1*2+2*3+3*4+…+(n-1)*n+n*(n+1)=?
1*n+2(n-1)+3(n-2)+.....+n*1求和?
写通项公式an=(n+3)(n+2)(n+1)n 求Sn=???
an=(n+3)(n+2)(n+1)n 求Sn=???写通项公式