x÷1.20.5

先化简再求值x/(x+2)-(x²+2x)/(x-5)÷[(x²-1)/(x-1)]其中x=根号三-2=x/(x+2)-x（x+2)/(x-5)÷（x+1）=x/(x+2)-x（x+2)/(x-5)（x+1）=[x（x-

(-x)^5÷x^2(-x)^5÷x^2=-x^5/x^2=-X^3-x^3(-x)^5÷x^2=-x^3

化简：2|x|-3x÷|2x-|5x||2|x|-3x÷|2x-|5x||(1)当x≥0原式=2x-3x÷(5x-2x)=2x-1(2)当xx>02x-1x2|x|-3x÷|2x-|5x||(1)当x≥0原式=2x-3x÷(5x-2x)=2

x(x-4)(x+4)-(x+3)(x²-6x+9)+5x³y²÷(x²y²)其中X=-3化简求值原式=x(x²-16)-(x³-6x²+9x+3x²

(x^-3x+2/x^-5x+6)^2÷(x-1/x^2-2x-3)^2(x^-3x+2/x^-5x+6)^2÷(x-1/x^2-2x-3)^2=[(x-1)(x-2)/(x-2)(x-3)]^2÷[(x-1)/(x-3)(x+1)]^2=

化简：[(x+2)/(x^2-4)-(2x-5)/(x-4x+4)]÷[(x-3)/(x-2)]解原式=[(x+2)/(x-2)(x+2)-(2x-5)/(x-2)²]×(x-2)/(x-3)=[1/(x-2)-(2x-5)/(x

【【【急】】】分式计算x^2-x-6/x-3÷x-3/x^2-5x+6x^2-x-6/x-3÷x-3/x^2-5x+6原式=[(x²-x-6)/(x-3)]÷[(x-3)/(x²-5x+6)]={[(x+2)(x-3)]

3-x/2x-4÷（x+2-5/x-2)(1/x+1+1/x-1)÷x/x+11/x+1-x+3/x²-1·x²-2x+1/x²+4x+3（1/x-1/2)÷（1-x²+4/4x）(3-x)/(2x-

6-5x+x^2x-3x^2+5x+4--------÷----×----------------x^2-164-x4-x^2上传不了图-（6-5x+x^2）/（x^2-16）÷（x-3）/（4-x）×（x^2+5x+a）/（4-x^2）a

计算：(x^3-3x^2)/(x^2+5x+6)÷(x^3-9x)/(x^2+2x-3)*(x+2)/(2x)(1)/(a-1)+(1)/(a+1)-(a^2+1)/(a^2-1)1.(x^3-3x^2)/(x^2+5x+6)÷(x^3-9

8x^2-4x/x^2-x-6÷(x-3/x+2-x+2/x-3),其中x=5200-4/5=199.28x^2-4x/x^2-x-6÷(x-3/x...

(（x²-5x+6)/(12-7x+x²))²÷((x²+3x+2)/(x²-2x+8))²其x=-2,求值为多少?"/"是分数线原式化简：{（x-3)(x-2)/(x-3)(x-

16-x^2/x^2-2x-3÷1^2-5x+4/x-316-x^2/x^2-2x-3÷1^2-5x+4/x-3=(16-x²)/(x-3)(x+1)×(x-3)/(x-1)(x-4)=-(x+4)/(x²-1)很高兴为

计算：(1)/(x-3)÷(x+2)/(x^2-9)-(1)/(x^2+5x+6)1/(x-3)÷(x+2)/(x^2-9)-1/(x^2+5x+6)=1/(x-3)÷(x+2)/[(x-3)(x+3)]-1/(x+2)(x+3)=1/(x

化简：x^2-5x+6/x^2-1÷x-3/x+1原式=(x-2)(x-3)/(x+1)(x-1)*(x+1)/(x-3)=(x-2)/(x-1)

(-x^2n-2)*(-x)^5÷[x^n+1*x^n*(-x)]=?-4x画个图,看出来,第一项x=1在高处,第二项x=2/5在谷底,后面的全都在两者之间所以最大的是a1=1最小的是a2=-4/5

(16x^4-5x³+3x²-6x)÷(-2x)(16x^4-5x³+3x²-6x)÷(-2x)=16x^4÷(-2x)-5x³÷(-2x)+3x²÷(-2x)-6x÷(-2x)=

x^2-10x+25/x-1÷x^2-1/5-x（x²-10x+25）/（x-1)÷(x²-1)/(5-x)=(x-5)²/(x-1)÷(x-1)(x+1)/(5-x)=-(x-5)³/(x-1)&#

(-x^2n-2)(-x)^5÷[x^n+1·x^n`(-x)](-x^2n-2)·(-x)^5÷[x^n+1·x^n·(-x)]=(x^2n-2)·(x)^5÷[-x^n+1·x^n+1]=-x^(2n-2+5)÷x^(2n+2)=-x^

使代数式x+3/x-3÷x+5/x-4有意义的x的值分母不等于0所以x-3≠0(x+5)/(x-4)≠0x-4≠0所以x≠3且x≠-5且x≠4