99-129.6÷x=69
99-129.6÷x=69
1X+2X+3X…+98X+99X+100X=50500X X等于多少?
1x+2x+3x+4x+5x+6x+7x…+99x=100
解方程:2x+4x+6x...+100x=1-(x+3x+5x+...+99x)
x-2x+3x-4x+...+99x-100x=25
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
2x^2-4x/x+2`x^2+2x/x^2-4x+4÷x/3x-6,其中x=根号3/2
(X+X)+(X-X)+(X*X)+(X/X)=100
x^3+x^2+x+1=0,则x^97+x^98+x^99+.x^103=
[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013
|x|÷(x-3)与(3-x)÷x为相反数,则x=_____
130%x+x=4.6 x÷50%=10 x/9-x/15=16%