解方程:(1-3x)/(1+3x)+(3x+1)/(3x-1)=12/(1-9x^2)
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解方程:(1-3x)/(1+3x)+(3x+1)/(3x-1)=12/(1-9x^2)
解方程:(1-3x)/(1+3x)+(3x+1)/(3x-1)=12/(1-9x^2)
解方程:(1-3x)/(1+3x)+(3x+1)/(3x-1)=12/(1-9x^2)
:(1-3x)/(1+3x)+(3x+1)/(3x-1)=12/(1-9x^2)
(1-3x)²-(1+3x)²=12
1-6x+9x²-1-6x-9x²=12
-12x=12
x=1
X=-1