先化简再求值:x2-1分之x除以(1 x-1分之1),其中x=根号2-1

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：

原式=【x(x+1)-x】/(x+1)÷【x²-1+1】/(x²-1)=x²/(x+1)÷x²/(x+1)(x-1)=x-1代入x=1原式=1-1=0如果本题有

=(x²-x-x)/(x+1)÷(x²-1+1)/(x+1)(x-1)=x(x-2)/(x+1)×(x+1)(x-1)/x²=(x-2)(x+1)/x取x=2则原式=0

解:原式=(x-y)×(xy)分之(xy)的平方-(x-y)的平方乘以(x的平方×y的平方)分之(y的平方-x的平方)=-(xy分之4)当x=2根号3,y=2-根号3时;代入-(xy分之4),结果为5

=【1/（x-1）²-1/（x+1）²】÷【1/（x+1）+1/（x-1）】=【（x+1）²-（x-1）²】/【（x-1）²（x+1）²】÷

(x分之X的平方+4-4)除的X平方+2x分之X的平方-4=[(x²+4)/x-4]÷[(x²-4)/(x²+2x)]=[(x²-4x+4)/x]÷[(x+2)

您好：原式=[x/(x-1)²-1/(x-1)]*（x²-1）/2=1/2[x/(x-1)²-1/(x-1)]*(x+1)(x-1)=1/2[x(x+1)/(x-1)-(

由[x/（x-2)-x/（x+2)]÷4/（2-x）=[（x²+2x-x²+2x）/（x-2）（x+2)]/4/（2-x）=4x/（x-2）（x+2)×（2-x）/4=-x/（x+

【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

[x+1-15/(x-1)]÷[(x^2-4x)/(x^2-x)]=[(x^2-1-15)/(x-1)]÷[x(x-4)/x(x-1)]=[(x^2-16)/(x-1)]÷[(x-4)/(x-1)]=

(x-x分之1)除x分之x+1=(x²-1)/x÷（x+1)/x=(x+1)(x-1)÷(x+1)=x-1=√2+1-1=√2本题有什么不明白可以追问,

x²+2x+1=10（x+1)²=10x+1=3或x+1=-3所以x=2或x=-4【（x²+4)/x-4】÷【（x²-4)/(x²+2x)】=【（x&

原式=(x-1)(x+1)/(x+2)*(x+2)/x-1=x+1然后代入数值即可很高兴为您解答,【学习宝典】团队为您答题.请点击下面的【选为满意回答】按钮,

(x^2-2x+1)/(x^2-1)+1/(x+1)=(x-1)^2/(x+1)(x-1)+1/(x+1)=(x-1)/(x+1)+1/(x+1)=x/(x+1)=1-根2分之一

x²-3x+2=0(x-1)(x-2)=0因为分母x-1≠0所以x-2=0x=2原式=x(x-1)/(x-1)*(x+1)(x-1)/(x-1)²=x*(x+1)/(x-1)=2*

{1-x/(x-1)}÷1/x(x-1)=(x-1-x)/(x-1)÷1/x(x-1)=-1/(x-1)÷1/x(x-1)=-x

（1-x+2分之1）除于x+2分之x的2次方-1=(1-x+1/2)/x+(x²-1)/2=(3/2-x)/x+(x²-1)/2=3/2x-1+x²/2-1/2=x

原式=(x²-4y²-x²-4xy-4y²)×(2/y)=(-8y²-4xy)×(2/y)=-16y-8x=-4+8=4

原式=(x+1)/(x+1)²×x(x-1)/[-2(x-1)]=-1/(x+1)×x/2=-x/2(x+1)当x=√2时原式=-√2/2(√2+1)=-√2(√2-1)/2=(√2-2)/