(n+1)(n+2)(n-4)(n-5)+k为完全平方式,求K的值急
来源：学生作业帮助网 编辑：六六作业网 时间：2024/12/23 07:00:00
(n+1)(n+2)(n-4)(n-5)+k为完全平方式,求K的值急(n+1)(n+2)(n-4)(n-5)+k为完全平方式,求K的值急(n+1)(n+2)(n-4)(n-5)+k为完全平方式,求K的
(n+1)(n+2)(n-4)(n-5)+k为完全平方式,求K的值急
(n+1)(n+2)(n-4)(n-5)+k为完全平方式,求K的值
急
(n+1)(n+2)(n-4)(n-5)+k为完全平方式,求K的值急
(n+1)(n+2)(n-4)(n-5)+k
=[(n+1)(n-4)][(n+2)(n-5)]+k
=(n^2-3n-4)(n^2-3n-10)+k
=(n^2-3n)^2-14(n^2-3n)+40+k
因为(n+1)(n+2)(n-4)(n-5)+k为完全平方式
所以40+k=49,k=9
所以(n+1)(n+2)(n-4)(n-5)+k=(n^2-3n-7)^2
(n+1)(n+2)(n-4)(n-5)+k
=(n+1)(n-4)(n+2)(n-5)+k
=(n²-3n-4)(n²-3n-10)+k
=(n²-3n-4)²-6(n²-3n+4)+k
因为是完全平方数，k=9
(n+1)(n+2)(n-4)(n-5)+k
=(n+1)(n-4)(n+2)(n-5)+k
=(n^2-3n-4)(n^2-3n-10)+k
=(n^2-3n)^2-4(n^2-3n-10)+k
=(n^2-3n)^2-4(n^2-3n)+40+k
=(n^2-3n)^2-4(n^2-3n)+4+36+k
=[(n^2-3n)-2]^2+36+k
即36+k=0
k=-36
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?
n+(n+1)+(n+2)+(n+3)+(n+4)=5n+10这道题怎么解
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,
1+(n+2)+(2n+3)+(3n+4)+(4n+5)+……((n-1)n+n)的答案
4^n+4^(n-1)C1/n+4^(n-2)C2/n+...+Cn/n=答案是5^n.
2^n/n*(n+1)
解方程(2n+1)(n+1)n-(2n-21)(n-10)(n-11)=2(2n-9)(n-4)(n-5)
证明不等式：(1/n)^n+(2/n)^n+(3/n)^n+.+(n/n)^n
求limn→无穷(1+2^n+3^n+4^n+5^n)^1/n
3(n-1)(n+3)-2(n-5)(n-2)
2^n*3^n*5^(n+1)/30^n
lim(n+3)(4-n)/(n-1)(3-2n)
lim(n^3+n)/(n^4-3n^2+1)
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
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
lim(1/n+2/n+3/n+4/n+5/n+……+n/n)=lim(1/n)+lim(2/n)+……+lim(n/n)成立吗?（n趋近于无穷大）为什么不成立?
一道数列求和题1/2n+3/4n+5/8n+...+（2n-1）/n*2^n
(n+1)(n+2)/1 +(n+2)(n+3)/1 +(n+3)(n+4)/1