x-0.45x=11．

（X+X)+(X-X)+(X*X)+(X/X)=100 (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 x+x=x+15 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 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!)+. 化简：|x+11|+|x-12|+|x+13|．