(11-X)+X-X+(11-X)=11
(2x-1)/(x-1)(x-2)=(x-5)/(x-2)(x-3) x/2x^2-11x-21=(x+7)/x^2-1
解方程:1/(x*x+11x-8)+1/(x*x+-8)+1/(x*x-3x-8)=0
解方程:5x(x+7)(x+4)=5x(x的平方+11x)
5x(x+7)(x+4)=5x(x^2+11X)
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
解方程x(2x-3)+3x+3x(x-2)=5x(x-4)+11
因式分解3x*x+11x+10
已知2x*x+x-5=0,求代数式6x*x*x+7x*x-13x+11的值
(x-1)(x²+mx+n)=x²-6x²+11x-6
(X+X)+(X-X)+(X*X)+(X/X)=100
|x+11|+|x-12|+|x+13|+|x-13|的最小值
5x方-11x-21=o x=?