先化简再求值(X-2分之X-X方-2X分之4)除以X方-X分之X 2-搜答案-搜狗做题网

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+(3x-2x)+(5x-4x)+……+(101x-100x)=x+x+……+x=51x=51×2/51=2

x/(x-3)-3x/(x^2-3x)-3/x通分得=x^2/(x^2-3x)-3x/(x^2-3x)-3*(x-3)/(x^2-3x)=(x^2-3x-3x+9)/(x^2-3x)=(x-3)(x-

(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/

小括号内先通分：分母为x平方-4,分子为3x平方+6x,另一个是x平方-2x化简：{x²-4分之2x²+8x}÷x²-4分之2x结果=x+4

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

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

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

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

分子分母同乘以4.再一化简

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-2分之x－x+2分之x除以x-2分之4x=[x/(x-2)-x/(x+2)]÷4x/(x-2)=(x²+2x-x²+2x)/(x-2)(x+2)÷4x/(x-2)=4x/(x-

原式=-[(x-3)/(x-2)]÷{[(x+2)(x-2)-5]/(x-2)]=-[(x-3)/(x-2)]÷[(x²-9)/(x-2)]=-(x-3)/(x+3)(x-3)=-1/(x+

（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/（-

（x-2-x+2分之5）÷2x+4分之x-3=（x-2-x+5/2）÷2x＋x/4-3=1/2÷2x＋x/4-3=1/4x＋x/4-3