化简|| 20±√-(20x-3)^2|+20|

通分:x+4/x^2-8x+15,x-5/x^2+x-12,x-3/x^2-x-20 化简x^2-4x+4/2x-4 3x^2-9x-12/x^2+2x+1 x^2-7x+12/-x^2+9x-20 xy-x-y+1/y^2-2y+1(1)x^2-4x+4/2x-4(2) 3x^2-9x-12/x^2+2x+1 (3)x^2-7x+12/-x^2+9x-20 (4)xy-x-y+1/y^2-2y+1 x²+12x+25=0,x+6=±√11,x=.x1=,x2=.35*26-35x-26x+x^2=850(8+x)(12+x)=165x^2+20x-69=0(x-3)(x+23)=0这个到后面咋写,弄成跟上面一样的格式. 2(x^2-x)^2-3(x^2-x)-20 因式分解(x+1)(x-2)(x-3)(x-6)+20 16x-x^3/x^2+x-20约分 3(x^4)^6-2(x^5×x^3)^3+x^11×x^13+x^20×x^3×x 计算:1/x(x-1)+1/(x-1)(x-2)+1/(x-2)(x-3)+.+1/(x-19)(x-20) 已知-2/3≤X≤5/2,化简√4x²+12x+9+√4x²-20x+25 2x(x-1)-x(3x+2)=(-x-1)(x+6)-20 解方程X(X+1)-X(X-3)=2(X+1)(X-1)+20 x(x+1)²-x(x²-3)-2(x+1)(x-1)=20 化简|| 20±√-(20x-3)^2|+20| 若x为实数,且有|x²-2x-8|+√2x²-3x-20=0,求根号x/(1-x) 化简：[√(x^2-6x+9)/x^2-x-12]*(x^3-16x)/(x^2-3x)-1/(x+3) {x＞3} √20x（x-1）²（x-2）²（x-3）².其中x＞3求解 f[x -x/8-x*x]=√2 10求x^2 20x^10 x 化简：1/√x(√x+2)+1/(√x+2)(√x+4)+...+1/(√x+18)(√x+20)