x方减x减1等于0
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当x=0时,等式不成立,所以x≠0等式两边除以x得:x+1/x=3x^3+1/(x^3)=(x+1/x)(x^2-1+1/x^2)=(x+1/x)(x^2-1+1/x^2+2-2)=(x+1/x)[(
(1)X²-5X+1=0,X²+1=5X由于可以判断X不等于0,所以两边同时除以XX+1/X=5X²+X^(-2)=X²+1/X²=(X+1/X)&s
x²+3x-1=0x²=-3x+1所以x³=x×x²=x(-3x+1)=-3x²+x=-3(-3x+1)+x=10x-3原式=(10x-3)+5(-3
x²-x-1=0,x≠0两边同除以x:x-1-1/x=0x-1/x=1,两边平方:x²+1/x²-2*x*1/x=1x²+1/x²-2=1x²
X^3-X-49=0实数解x=(49/2+((49/2)^2+(-1/3)^3)^(1/2))^(1/3)+(49/2-((49/2)^2+(-1/3)^3)^(1/2))^(1/3)≈3.75037
X²+2X-1=0两边同时除以x得x+2-1/x=0x-1/x=-2两边同时平方得x²+1/x²=6两边同时平方得x4+1/x4=34
因为x^2+x-1=0所以x^2+x=1x^3+2*x^2-7=(x^2+2*x)x-7=(1+x)x-7=x+x^2-7=1-7=-6
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
x^2-x-1=0x^2-x+0.25-1.25=0(x-0.5)^2=1.25x-0.5=±0.5√5x=0.5(1±√5)
再答:采纳一下,好吗?谢谢了再问:那x的平方加负3分之11加2等于0了再答:采纳一下再答:
x²+5x-1=0除以x得x+5-1/x=0x-1/x=5x²+1/x²=(x-1/x)²+2=5²+2=27x^4+1/x^4=(x²+1
x^2-3x=130x^2-3x-130=0(x-13)(x+10)=0x=13或x=-10
x+y=1(1).(x+y)(x-y)=9x-y=9(2)(1)+(2):2x=10x=5,(1)-(2):y=-4再问:能再详细点么(>﹏
x²-4x+1=0两边同时除以xx-4+1/x=0x+1/x=4两边同时平方x²+2+1/x²=16x²+1/x²=14两边同时平方x^4+2+1/x
(x^2+y^2)*(x^2-1+y^2)-12=0可以设x^2+y^2=z那么有z(z-1)=12z^2-z-12=0(z-4)(z+3)=0z=4或z=-3但z是平方和一定大于0所以z=4记得采纳
x-1/x=1x^2+1/x^2=(x-1/x)^2+2=1+2=3x^3-1/x^3=(x-1/x)(x^2+1+1/x^2)=1*(3+1)=4不懂可追问,有帮助请采纳,谢谢!再问:x^3-1/x
6x²-5x-21=0(2x+3)(3x-7)=02x+3=03x-7=0∴x1=-3/2x2=7/3
x³-729=0x³=9³x=9再问:能说一下过程吗再答:这就是过程啊很详细了
x(x^2-1)=0解出x=-1、0、1