x的方减9分之12减x减3分之2等于x加3分之1-搜答案-拍题作业网

设x+1/x=t,平方得:x^2+1/x^2+2=t^2x^2+1/x^2=t^2-2原方程变为:(t^2-2)-3t-8=0t^2-3t-10=0(t-5)(t+2)=0t=5或t=-2.即x+1/

请楼主描述清楚一些

3/(x+1)

很多题目说的不详细,不清楚我理解的是否与你的题目一样原式=(1+x)[(x-1)/x(x+1)-(1-x)/x(x-1)]=(1+x)[(x-1)/x(x+1)+1/x(x+1)]=(x+1)[(x-

因为X^2-3X-1=0所以x-1/x=3(x-1/x)^2=3^2=9x^2+1/x^2-2=9x^2+1/x^2=11(x^2+1/x^2)^2=121x^4+1/x^4=121-2x^4-3+1

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)

【俊狼猎英】团度为您解答~原式=[(x^2-y^2)*2(x-y)^2]/[xy(xy-y^2)]先约掉一个(x-y),分子分母同时处以y^3得到2[(y/x)^2-1]*[(y/x)-1]/[(y/

x^2-3x+1=0x^2=3x-1x^2+1=3xX的4次方+X的方+1分之X的方=x^2/[(x^2+1)^2-x^2]=x^2/(9x^2-x^2)=1/8

1/（x-1）-1/(x+1)-2/(x^2+1)-4/(x^4+1)=2/(x^2-1)-2/(x^2+1)-4(x^4+1)=4/(x^4-1)-4/(x^4+1)=8/(x^8-1)2/(x+1

x=1/(2+√3)xy=1y=(2+√3)x=1/(2+√3)x=(2-√3)/(2+√3)(2-√3)x=2-√3(x^2y-xy^2)/(x^2-y^2)=xy(x-y)/(x+y)(x-y)=

x²-3x=x(x-3)x²-9=(x+3)(x-3)所以最简公分母是x(x+3)(x-3)

自己想

正负根号5

(x²+4)/(x-2)+4x/(2-x)=(x²+4)/(x-2)+(-4x)/(2-x)(-1)=(x²+4)/(x-2)-4x(x-2)=(x²-4x+4

X平方+3X+1=0两边除以x,x+3+1/x=0x+1/x=-3,两边平方x^2+1/x^2+2=9,x^2+1/x^2=9-2=7

把每个式子因式分解x的方+5x+4=（x+1）(x+4)x方-5x+6=(x-2)(x-3)………………

原式=[2x(x+y)-5x²]/[5x²(x+y)²]=(-3x²+2xy)/[5x²(x+y)²]=(-3x+2y)/[5x(x+y)&

(x＋y)/(x)=31＋(y/x)=3得：y/x=2则：(x²＋y²)/(x²－xy＋y²)【分子分母同除以x²】=[1＋(y/x)²]/

x属于任何实数