若n等于-1,则n-2n+3n-4n+5n-6n+······+99n-100n的值为______

Sn=n(n+2)(n+4)的分项等于1/6[n(n+2)(n+4)(n+5)-(n-1)n(n+2)(n+4)]吗? 若n等于-1,则n-2n+3n-4n+5n-6n+······+99n-100n的值为______ 若n等于1或-1,求n-2n+3n-4n+…+49n的值 下列几组力中,合力不可能等于0的是 A.3N 4N 6N B.1N 2N 4N C.2N 4N 6N D.5N 5N 1N n(n+1)(n+2)(n+3)+1等于多少 (n-3)(n-2)(n-4)等于120 求n n+(n+1)+(n+2)+(n+3)+(n+4)=5n+10这道题怎么解 当n为正整数时,定义函数N(n)表示n的最大奇因数.N(3)=3N(10)=5S(n)=N(1)+N(2)+N(3)+...+N(2^n）当n为正整数时,定义函数N(n)表示n的最大奇因数.如N(3)=3N(10)=5.记S(n)=N(1)+N(2)+N(3)+...+N(2^n）则S(4)=---- S(n)=------求 证明不等式：(1/n)^n+(2/n)^n+(3/n)^n+.+(n/n)^n 1/[n(n+1)]+1/[(n+1)(n+2)]+1/[(n+2)(n+3)]+1/[(n+3)(n+4)]+[(n+4)(n+5)}怎么算谢谢了, 为什么lim n趋向无穷 (5n^2-4n)/(3n^2+2n-1)等于5/3 请问(n+1)(n^2+1)(n^3+1)(n^4+1)(n^5+1)等于多少? 1+(n+2)+(2n+3)+(3n+4)+(4n+5)+……((n-1)n+n)的答案 如果正整数n使得［n/2]+[n/3]+[n/4]+[n/5]+[n/6]=69,则n= 如果正整数n使得［n/2]+[n/3]+[n/4]+[n/5]+[n/6]=69,则n= lim（n->无穷大）（1^n+2^n+3^n+4^n）^1/n等于多少 n(n+1)(n+2)等于多少? 3(n-1)(n+3)-2(n-5)(n-2)