(1-3x)/(1+3x)+(3x+1)/(3x-1)=12/(1-9x²)
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(1-3x)/(1+3x)+(3x+1)/(3x-1)=12/(1-9x²)(1-3x)/(1+3x)+(3x+1)/(3x-1)=12/(1-9x²)(1-3x)/(1+3x)+
(1-3x)/(1+3x)+(3x+1)/(3x-1)=12/(1-9x²)
(1-3x)/(1+3x)+(3x+1)/(3x-1)=12/(1-9x²)
(1-3x)/(1+3x)+(3x+1)/(3x-1)=12/(1-9x²)
X=-1
x等于3分之根号5
(1-3x)/(1+3x)+(3x+1)/(3x-1)=12/(1-9x²)
(1-3x)^2+(1+3x)^2=12
18x^2+2=12
18x^2=10
9x^2=5
3x=±√5
x=1/3√5 x=-1/3√5
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