1+2+3+4……+98+99+100=()x()
1X+2X+3X…+98X+99X+100X=50500X X等于多少?
1x+2x+3x+4x+5x+6x+7x…+99x=100
方程(1X+2X+3X…+98X+99X+100X=50500X)请问X等于多少?
f(x)=1+x-x²/2+x³/3-x^4/4+…+x^2013/2013
已知x^4+x^3+x^3+x^2+x^1+1=0,求x^100+x^99+x^98+x^97+x^96的值
x^4+X^3+X^2+X^1+1=0求x^100+X^99+X^98+X^97+X^96的值
已知x^4+x^3+x^2+x^2+1=0,求x^100+x^99+x^98+x^97+x^96的值
已知x^4+x^3+x^2+x+1=0,求1+x+x^2+x^3+……+x^2004的值.(x^2是x的2次方)
解方程:2x+4x+6x...+100x=1-(x+3x+5x+...+99x)
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
计算1/(x+1)(x+2)+1/(x+2)(x+3)+1/(x+3)(x+4)+……+1/(x+2007)(x+200
求和:Sn=1+3x+5x*x+7x*x*x+……+(2n-1)x^n-1 (x不为0和1)