先化简再求值:(1)2分之三倍的根4加根号9分之X减3X倍的根号X分之一
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原式=(a-2)/a(a+2)-(a-1)/(a+2)平方=(a平方-2a-a平方+a)/a(a+2)平方=-1/(a+2)平方=-1/5
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/
√a/b+√b/a∵a+b>0ab>0∴a>0,b>0∴√a/b+√b/a=∨ab/b-√ab/a=(a+b)√ab/ab=√6
/表示分数线原式={[(x²-2x+1)/(x²-1)]+1/x}÷[1/(x+1)]={[(x-1)²]/[(x+1)(x-1)]+1/x}×(x+1)={[(x-1)
a=2/﹙1-√3﹚=﹣﹙√3+1﹚﹙a²-1﹚/﹙a-1﹚+√﹙a²+2a+1﹚/﹙a²+a﹚-1/a=a+1-1/a-1/a=a+1-2/a=﹣√3-1+1+2/﹙√
=(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
1、原式=2a/(a+2)(a-2)-1/(a-2)=(2a-a-2)/(a+2)(a-2)=1/(a+2)当a=√3-2时,原式=1/√3=√3/3.2、原式=43-12√35.3、原式=15/2√
根号32减三倍根号2分之1加1=四倍根号2减三倍根号2分之1加1=四倍根号2减二分之三倍根号2加1=二分之五倍根号2加1
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
(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
a^2-1+2-1/a=a^2-1/a+1,a=-3代入,得原式=31/3
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+1/2=0,y-1=0x=-1/2,y=1原式=4x²y-(6xy-8xy+4-x²y)+1=4x²y-(-2xy+4-x²y)+1=4x²y+2
(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=(a+b)(a-b)/ab(a+b)÷(a²+b²-2ab)/2ab=(a-b)/ab×2ab/(a-b)²=2/(a-b)=2/(3+√5-3+√5)=√5/5