x-17=3x-207

x+1/x=3x^2+1=3xx^2=3x-1x^4+3x^3-16x^2+3x-17=x^2(3x-1)+3x^3-16x^2+3x-17=6x^3-17x^2+3x-17=6x(3x-1)-17x

x+3/5x=16/178/5x=16/17x=16/17÷8/5x=10/17如果本题有什么不明白可以追问,另外发并点击我的头像向我求助,请谅解,

x+17=3/5x+675x+75=3x+3255x-3x=325-752x=250x=125x+1/5x=18.65x+x=936x=93x=18.65x+2=x+55x-x=5-24x=3x=3/

（3x+5)/(x+2)=[(3x+6)-1]/(x+2)=3-1/(x+2)后面都类似化简3-1/(x+2)+3-1/(x+9)=3-1/(x+6)+3-1/(x+5)1/(x+2)+1/(x+9)

由条件式x+(1/x)=3两边乘以x得x^2-3x+1=0故x^4+3x^3-16x^2+3x-17=x^4-3x^3+x^2+6x^3-17x^2+3x-17=x^2*0+6x^3-18x^2+6x

是这样的：x^5+x^4=x^3(x^2+x)=(x^2+x)[(x^3-1)+1]=(x^2+x)(x^3-1)+x^2+x=[x(x+1)(x-1)](x^2+x+1)+x^2+x=(x^3-x)

4X+15-3X=17X=2

x(x^2-2)+2x^2(x+3)-3x(5x-7)=x(3x^2-9x+17)+2=>x^3-2x+2x^3+6x^2-15x^2+21x=3x^3-9x^2+17x+2=>2x=2x=1

x+1/x=3x^2+1=3xx^2=3x-1x^4+3x^3-16x^2+3x-17=x^2(3x-1)+3x^3-16x^2+3x-17=6x^3-17x^2+3x-17=6x(3x-1)-17x

原式=17x^2-8x^2-5x-4x^2-x十3-5x^2十6x-1-3=17x^2-17x^2-6x十6x-1=-1与x的值无关所以无论x取何值代数式值恒为-1

x(1+2+...+9)=x(9-8-7-...-1)x=0记得采纳啊

15x=23x-248x=24x=312+5x=3x-82x=-20x=-103(x-3)=9-(x+6)4x=9+9-6=12x=34+x=4x-173x=21x=7

首先整理下7X-15/X-4=14X-31/2X-8,31/2X-15/X=7X-4,两边都乘以2X得14X*X-8X-1=0.然后根据公式X=-b正负根号(§)下b方-4ac得解为X1=(4+§30

设x1=4-√3,x2=4+√3,是方程X^2-8X+13=0的两根所以X1^2-8X1+15=2X^4-6X^3-2X^2+18X+23=(X+1)^2*(X^2-8X+13)+10=10所以原式=

4（5-x)+3x=17去括号20-4x+3x=17合并同类项-x=17-20=-3x=3

应该是-2x²,不是-3x²3x²-x=1原式=9x^4-3x³+15x³-5x²+3x²-7x+2001=3x²(3x

x+17=3(x+13),x+17=3x+39x-3x=39-17-2x=22x=22/-2x=-112x-11.2=0.6x,2x-0.6x=11.21.4x=11.2x=11.2/1.4x=82.

#includesintjiesheng(intn)//用于计算阶乘如：3!{if(n=1)rerunn;returnn*hh(n-1)}doubledigui(intn,intx)//用以计算y=x

解x(x²-2)+2x²(x+3)-3x(5x-7)=x(3x²-9x+17)+2x³-2x+2x³+6x²-15x²+21x=3