1/x2-4x-1/4-16x

(x2+4x)/(x-1)(x2+4x)/(x-1)(x2+4x)/(x-1)(x²+4x)/(x-1)≤0x(x-1)(x+4)≤0(其中x≠1)使用序轴标根法,得：x≤-4或0≤x

约分1-x2/x2-3x-4约分1-x2/x2-3x-4约分1-x2/x2-3x-41-x2=(1-x)(1+x)x2-3x-4=(x+1)(x-4)共同约去（x+1)即可

(1-x2)(x2-4x+5)(1-x2)(x2-4x+5)(1-x2)(x2-4x+5)因为（x2-4x+5）是永远大于零的,它的b2-4ac

不等式（x2-4x-5)(x2+1)不等式（x2-4x-5)(x2+1)不等式（x2-4x-5)(x2+1)因为x2+1>0所以x2-4x-5（x2-4x-5)(x2+1)(x-5)(x+1)(x^2

：(x2-16)/(x2+8x+16)+x/(x-4)除以1/x2-16,其中x=根号2+2：(x2-16)/(x2+8x+16)+x/(x-4)除以1/x2-16,其中x=根号2+2：(x2-16)

通分3x/x2-2x,2x+1/4-x2,3/2x2+4x通分3x/x2-2x,2x+1/4-x2,3/2x2+4x通分3x/x2-2x,2x+1/4-x2,3/2x2+4x3x/(x^2-2x)=3

问几个分式化简的问题：a2-ab/b2-abx2+x/x2-1x2+4x/x2+8x+16x2-2x/2y-xy问几个分式化简的问题：a2-ab/b2-abx2+x/x2-1x2+4x/x2+8x+1

3/x2-3x+2-1/x-2=1/x2-x+4/x2-2x3/x2-3x+2-1/x-2=1/x2-x+4/x2-2x3/x2-3x+2-1/x-2=1/x2-x+4/x2-2x3/(x²

计算:x2-5x+6/x2-4x+3+x2-4x+3/x2-2x+1+x2-3x-4/1-x2计算:x2-5x+6/x2-4x+3+x2-4x+3/x2-2x+1+x2-3x-4/1-x2计算:x2-

4x2-4x+1=x2+6x+94x2-4x+1=x2+6x+94x2-4x+1=x2+6x+91.4x²-4x+1=x²+6x+9(2x-1)²=(x+3)²

化简√(16-8x+x2)-√(x2-2x+1)(1＜x＜4)化简√(16-8x+x2)-√(x2-2x+1)(1＜x＜4)化简√(16-8x+x2)-√(x2-2x+1)(1＜x＜4)1＜x＜4√(

证明:根号(x2+2x+4)-根号(x2-x+1)证明:根号(x2+2x+4)-根号(x2-x+1)证明:根号(x2+2x+4)-根号(x2-x+1)要使根号(x2+2x+4)-根号(x2-x+1)则

因式分解(x2+2x)2+2x2+4x+1因式分解(x2+2x)2+2x2+4x+1因式分解(x2+2x)2+2x2+4x+1(x^2+2x)^2+2x^2+4x+1=(x^2+2x)^2+2(x^2

（x+2)(x2-2x+4)+（x-1)(x2+x+1),其中x=-三分之二（x+2)(x2-2x+4)+（x-1)(x2+x+1),其中x=-三分之二（x+2)(x2-2x+4)+（x-1)(x2+

(x+1)(x2-x+1)+(x-2)(x2+2x+4),其中x=-3/2(x+1)(x2-x+1)+(x-2)(x2+2x+4),其中x=-3/2(x+1)(x2-x+1)+(x-2)(x2+2x+

分解因式:4(3x2-x-1)(x2+2x-3)-(4x2+x-4)2分解因式:4(3x2-x-1)(x2+2x-3)-(4x2+x-4)2分解因式:4(3x2-x-1)(x2+2x-3)-(4x2+

x2-4x+1=0,则x+1/x=?x2+1/x2=?x2-4x+1=0,则x+1/x=?x2+1/x2=?x2-4x+1=0,则x+1/x=?x2+1/x2=?x²-4x+1=0x&sup

先化简,再求值：（4x2-3x)-2（x2+2x-1)-（x2+x-1)先化简,再求值：（4x2-3x)-2（x2+2x-1)-（x2+x-1)先化简,再求值：（4x2-3x)-2（x2+2x-1)-

(X2-X)2+(X2+3X+2)2-4(X2+X+1)2因式分解(X2-X)2+(X2+3X+2)2-4(X2+X+1)2因式分解(X2-X)2+(X2+3X+2)2-4(X2+X+1)2因式分解(

解方程(x2-8x+16)2x--------------=-------(x2-4x+14)x-2刚刚题没发好(x2-8x+16)/(x2-4x+14)+（1+2/（x-2））2=2x/(x-2)解