7x-11=5x+27

7x-11=5x+27 (2x-1)/(x-1)(x-2)=(x-5)/(x-2)(x-3) x/2x^2-11x-21=(x+7)/x^2-1 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!)+. 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 x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? 已知2x*x+x-5=0,求代数式6x*x*x+7x*x-13x+11的值 2x+3x+4x+5x+x+6x+7x=100 (x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2 x的平方+5x+7=3x+11 x-4/x-5 - x-5/x-6=x-7/x-8 - x-8/x-9求x=?