x(1+50%)×80%-100=x+300
(X+X)+(X-X)+(X*X)+(X/X)=100
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除55%=100 60%x=30 x+50%x=4.5 (1-25%)x=72 4x+40%x=176 解方程
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-1)(X-2)(x-3)...(x-50)+x(x-2)(X-3)...(X-50)+...+x(x-1)(x-2)
X+X+X+X+X+X+100X=1690 问:X等于多少
数x满足x+1/x=-1,则x^300+1/x^300=?
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
1/x(x+1)(x+2)+1/(x+1)(x+2)(x+3).+1/(x+98)(x+99)(x+100)=?
已知x=100,求x(x+1)分之1+(x+1)(x+2)分之1+(x+2)(x+3)分之1+.+(x+99)(x+10