x/50+3(x+300)/100=300.x=?
(X+X)+(X-X)+(X*X)+(X/X)=100
2x+3x+4x+5x+x+6x+7x=100
3x=x+100 x=?
用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+.
3x=x+100 x=50
3x=100+x
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)
3X+(100-X)/3=100 9X+100-X=300 8X=200 X=25
x-2x+3x-4x+...+99x-100x=25
X+X+X+X+X+X+100X=1690 问:X等于多少