x-50/3=x+70/5?

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!)+. x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? 5x/(x+3)(x+2)+2x-5/(x-4)(x+3)=7x-70/(x+2)(x+4) 5x/(x+3)(x+2)+（2x-5）/(x-4)(x+3)=（7x-70）/(x+2)(x+4) 2x+3x+4x+5x+x+6x+7x=100 解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6) 已知3x*x-x=1,求6x*x*x+7x*x-5x+2000 3x+5x=?x等于 5X+6(X+10)+10(X+30)+6(X+70)+3(X+150)=2730,X等于多少 5*(x-2)=4*(x+3) 2x+（50-x）*4=140 3x-(8-x)=20*4 200x=(x-0.5)*2 x-50/3=x+70/5的意义是