50-x=5×14-5x

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!)+. 1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550 x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x 已知x*x-5x=14,求(x-1)(2x-1)-(x+1)*(x+1)+1的值 x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? 5x+2=-8 x=30 3x=5x-14 x 1、14x(x+6)-6x=8x(2x+5) 已知x²-5x=14,求(x-1)(2x-1)-(x+1.. (x-1)(2x-1)-(x+1)2+1,其中x²-5x=14, 2x+3x+4x+5x+x+6x+7x=100 解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6) (x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2