环境中的生物多样性:1^n+2^n+3^n......+m^n=

"1^n+2^n+3^n......+m^n=? 1^n+2^n+3^n......+m^n= （m-n)2(n-m)3(n-m)4 x=n*(n+1)*(n+2)*(n+3)....... n/(n-2)+n/(n-3)+n/(n-4)+n/(n-5)+...+2/(-1)=? 已知|m+5|+(n-1)^100=0,求(m-7n)(9m+3n)+(4m-n)(9n-2m) 设n是整数,证明:M = n^3+3/2n^2+1/2n 1*n+2(n-1)+3*(n-2)+......+(n-1)*2+1*n 若实数m,n满足条件m+n=3,且m-n=1,则m=( ),n=( ). m+n=0,那么m^3-m^2n-mn^2+n^3是多少