一元三次方程怎么解1/X3+1/(X-1)3=0

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一元三次方程怎么解1/X3+1/(X-1)3=0

一元三次方程怎么解1/X3+1/(X-1)3=0
一元三次方程怎么解1/X3+1/(X-1)3=0

一元三次方程怎么解1/X3+1/(X-1)3=0
1/X^3+1/(X-1)^3=0
1/X^3=-1/(X-1)^3
X^3=-(X-1)^3
X^3=-X^3+3X^2-3X+1
2X^3-3X^2+3X-1=0
2X^2-2X^2+2X-X^2+X-1=0
2X(X^2-X+1)-(X^2-X+1)=0
(X^2-X+1)(2X-1)=0
X^2-1+1=0(无解),2X-1=0
X=1/2

1/x3=-1/(x-1)3=1/(1-x)3
即x=1-x
得x=1/2

很明显,分母互为相反数,一个等式,再开三次方,得X为二分之一