先化简后求值x 1分之2x-1-X分之X平方-1,其中x=根号2-1
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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:
x1+x2=-5,x1x2=-31)|x1-x2|^2=(x1+x2)^2-4x1x2=25+12=37|x1-x2|=√372)1/x1^2+1/x2^2=(x1^2+x2^2)/(x1x2)^2=
=(x+2分之1)÷x的平方-4分之x的平方-2x+1=(根号2+0.5)/2-1-2根号2+1=0.5根号2+0.25-2根号2=-(3根号2)/2+0.25
(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/
你写的看不懂分子分母的代数式用括号括起来否则分不出来先通分【((x-2)(x+2)-x(x-1))/x(x+2)(x+2)】(x+2)/(x-4)=(x-4)/x(x+2)(x-4)=1/x(x+2)
X1+X2=-B/A=2X1*X2=C/A=1/2求得X1=1+根号2或者X1=1-根号2从而求出X2的值X1/X2+X2/X1=(X1*X1+X2*X2)/(X1X2)=6
(1+1/(x-1))÷x/(x²-1)=x/(x-1)÷x/(x+1)(x-1)=x/(x-1)×(x+1)(x-1)/x=x+1代入可得结果等于-1
=(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
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+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+
=(x+1)/((2*x+1+x^2)/x)=(x+1)/((x+1)^2/x)=(x+1)*x/(x+1)^2=x/(x+1)代入x=-3/2得到:原式=3
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/(-
2(x+4)-3(3x-1)>62x+8-9x+3>6-7x>-5x
2√2-2或-2√2-2
[(x+2)/x-(x-1)/(x-2)]÷(x-4)/x=[1+2/x-1-1/(x-2)]×x/(x-4)=(x-4)/x(x-2)×x/(x-4)=1/(x-2)=1/(3-2)=1这是我在静心
x1+x2=4x1x2=-1(x1+x2)^2/(1/x1+1/x2)=(x1+x2)^2*x1x2/(x1+x2)=x1x2*(x1+x2)=-4
(x+1分之1+x-1分之1)·(x平方-1)=x+1分之1·(x平方-1)+x-1分之1·(x平方-1)=x-1+x+1=2x