计算:x的二次方-3x 2分之1 x的二次方-5x 6分之1

(x+2)/(x-2)-1=3/(x²-4)(x+2-x+2)/(x-2)=3/(x-2)(x+2)(x≠2)4=3/(x+2)4x+8=34x=-5x=-5/4你的题目不够清晰

/>x=3/2(1-2x)²(2x+1)²-(3+2x)²(3-2x)²=[(1-2x)(1+2x)]²-[(3+2x)(3-2x)]²=(

x-x分之1=3x^2-2+1/x^2=9x^2+1/x^2=11x^4+1=11x^2x^4=11x^2-1x-x分之1=3x^2-1=3xx^2=3x+1x的四次方-2x的三次方-2x的二次方-7

第一问：把x+1/x=3两边平方得：x^2+(1/x)^2=7.第二问：(x-1/x)的平方=[x^2+(1/x)^2]-2=7-2=5.

X方-X+1分之X=7(x²-x+1)/x=1/7x-1+1/x=1/7x+1/x=8/7X四次方+X二次方+1分之X二次方分子分母同时除以x²=1/(x²+1+1/x&

看你的题目都看了很少时间(x-4)/(x^2-1)÷(x^2-3x-4)/(x^2+2x+1)+1/(x-1)=(x-4)/(x^2-1)[(x^2+2x+1)/(x^2-3x-4)]+1/(x-1)

x+1/x=3x²+1/x²=(x+1/x)²-2=9-2=7x²/(x^4+x²+1)=1/(x²+1/x²+1)=1/(7+1

x的平方-3x+1=0两边除以x得x-3+1/x=0∴x+1/x=3两边平方得x²+2+1/x²=9x²+1+1/x²=8x²/(x的4次方+x

x²-7/x+x²-3/x=x²-6?是这样么再问：有详细的吗再答：我是为你的题目就是这样么？？你方程两边同时乘以x（x+1）（x-1）得到；7x-7+3x+3=6x;4

x^2-3x+1=0x^2+1=3x两边除xx+1/x=3平方x^2+2+1/x^2=9x^2+1/x^2=9-2=7

x1+x2=-1/3x1x2=-1/3(1)x1²+x2²=(x1+x2)²-2x1x2=1/9+2/3=7/9(2)1/x1+1/x2=(x1+x2)/(x1x2)=1

第一题x/2+y/3=1（1）x-y=5（2）整理（1）得：3x+2y=6(3)(2)×2+（3）得：5x=16x=16/5把x=16/5代入（2）得：y=x-5=16/5-5=-9/5所以,原方程组

我操,你这样鬼能看懂啊?分子是啥分母是啥,那些加、除都在什么位置上啊?

x1+x2=5;x1x2=1;(1)x1/x2+x2/x1=(x1²+x2²)/(x1x2)=((x1+x2)²-2x1x2)/(x1x2)=(25-2)/1=23;(2

由x2(x的二次方)+x-1=0得出x2(x的二次方)+x=1那么：x3(x的三次方)+2x2(2x的二次方)-3=x3(x的三次方)+x2(x的二次方)+x2(x的二次方)-3=x【x2(x的二次方

(x-1)/(x^2+3x+2)+6/(2+x-x^2)-(10-x)/(4-x^2)=(x-1)/(x+1)(x+2)-6/(x+1)(x-2)-(x-10)/(x+2)(x-2)=[(x-1)(x

(-3)^2=99/(5/9)=81/5(81/5)*(-2/3)=-162/15(-162/15)^2=25921/22525921/225-1=(25921-225)/225=25696/225

2x^5-5x^4+2x^3-8x^2+3x=2x^5-6x^4+2x^3+x^4-3x^3+x^2+3x^3-9x^2+3x=2x^3(x^2-3x+1)+x^2(x^2-3x+1)+3x(x^2-

（1/x的二次方+x）+（2/x的二次方+4x+3）+（3/x的二次方+9x+18）=1/[x(x+1)]+2/[(x+1)(x+3)]+3/[(x+3)(x+6)]=[(1/x)-1/(x+1)]+

利用：a³－b³=(a－b)(a²＋ab＋b²)a³＋b³=(a＋b)(a²－ab＋b²)则：(x－3)(x²