先化简再求值x²-1分之x²-2x 1 (1-x 1分之3),其中x=0-搜答案-智慧作业帮

题目有误吧(x-x)x-1分之4(x-x)+(x-2)再问：(x方-x)(x-2)方再答：

(x-1/x)/((x²-2x+1)/x)=((x²-1)/x)/((x-1)²/x)=(x+1)(x-1)/(x-1)²=(x+1)/(x-1)=6/4=3/

x=1/(√2+1)=√2-1原式=x(x+2)/(x+1)÷(x²+x-2)/(x+1)-1=x(x+2)/(x+1)*(x+1)/(x+2)(x-1)-1=x/(x-1)-1=(x-x+

等于-2吧

【先化简再求值】（x-1）分之x÷【(1-x分之1）-1-x】=（x-1）分之x÷（x^2/(1-x)）=-1/xx=1时,原式无意义,x=2时,原式=-1/2,x=0时,原式无意义【选择题】下列约分

只有我能看懂吧?!再答：再答：题是这样的吗？再答：再问：你终于回来了再问：在吗再答：在再问：等等我去写题再问：去吧

原式=[3x/(x-1)-x/(x+1)]×[(x²-1)/x]={3x(x+1)/[(x-1)(x+1)]-x(x-1)/[(x-1)(x+1)]}×[(x-1)(x+1)/x]=[3x(

=(x+1)(x-1)/x÷(x-2x+1)/x=(x+1)(x-1)/x×[-x/(x-1)==x+1当x=√2时原式=√2+1再问：对不起，是我没说明白x²-1÷(1-x分之2x-1)是

(x+y)/[1/(x^2+y^2)]/(x^4-y^4)=(x+y)(x^2+y^2)/[(x^2-y^2)(x^2+y^2)]=(x+y)/(x^2-y^2)=1/(x-y)=1/(8-11)=-

答案是不是二分之X+2的平方—X的平方之一最后是5+2倍的根下2

原式=[3/(x-1)-1/(x+1)]÷x/(x²-1)=[3/(x-1)-1/(x+1)]×(x²-1)/x=[3/(x-1)]×(x²-1)/x-[1/(x+1)]

（x+1）÷[2+x分之(1+x²)]=（x+1）÷[x分之(2x+1+x²)]=(x+1)÷[x分之(x+1)²]=(x+1)·[(x+1)²分之x]=(x+

原式=x^2/(x-1)+1/(1-x)=(x^2-1)/(x-1)=(x+1)(x-1)/(x-1)=x+1x=-3/2原式=-3/2+1=-1/2如果有疑问请点【评论】或者【追问】再问：-a分之1

（x+3）/（x²-9）+3/（x-3）=（x+3）/（x-3)(x+3)+3/（x-3）=1/（x-3）+3/（x-3）=4/（x-3）代入x=-1/2原式=4/（-1/2-3）=4/（-

原式=2x²-(7x-4x+3-2x²)=2x²-(3x+3-2x²)=2x²-3x-3+2x²=4x²-3x-3=4×1/4+3