6n-10+2n+3怎么做 化简
[3n(n+1)+n(n+1)(2n+1)]/6+n(n+2)化简
用数学归纳法证明 1+2+3+..+n=1\2n(n+1)怎么做
(m²-6mn+9n²)÷(m-3n)-(4m²-9n²)-(2m-3n)怎么做
化简(n+1)(n+2)(n+3)
5(m-2n)方-3(m+n)+2(m+n)-8(m-2n)方,其中m=-10,n=-6时,怎么算
化简:根号下1*5*10+2*10*20+n*5n*10n分之1*2*3+2*4*6+n*2n*3n
化简(1*3*4+2*6*8……n*3n*4n)/(1*3*5+2*8*10+……n*4n*5n)
用c++编写 n^1+n^2+n^3+……+n^20 n=1,2,3,4,5,用一个递归函数怎么做?
1*2*4 2*4*8 .n*2n*4n/1*3*9 2*6*18 .n*3n*9n怎样做方便
1+3+5+7+9.+(2n-1)怎么做
化简:1/(n+1)(n+2)+1/(n+2)(n+3)+1/(n+3)(n+4)
证明不等式:(1/n)^n+(2/n)^n+(3/n)^n+.+(n/n)^n