65/100 ( x-1)=37/100(x +1)+0.
x²-3x+1=0.求2x³-3x²-7x+2009
2x(x-1)+2=x(x+1)
(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-2分之X=X-5分之X-4怎么解?还有X减3分之X等于X减1分之X+1
1+x+x^2+x^3+.+x^99+x^100
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
已知函数f(x)={-x^2+(1/2)x,x
先化简,在求值.9x+6x²-3(x-三分之二x²)其中x=-1
1/x(x+1)(x+2)+1/(x+1)(x+2)(x+3).+1/(x+98)(x+99)(x+100)=?