(1-3x)/(1+3x)-(3x+1)/(3x-1)=12/(1-9x的平方)
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(1-3x)/(1+3x)-(3x+1)/(3x-1)=12/(1-9x的平方)(1-3x)/(1+3x)-(3x+1)/(3x-1)=12/(1-9x的平方)(1-3x)/(1+3x)-(3x+1)
(1-3x)/(1+3x)-(3x+1)/(3x-1)=12/(1-9x的平方)
(1-3x)/(1+3x)-(3x+1)/(3x-1)=12/(1-9x的平方)
(1-3x)/(1+3x)-(3x+1)/(3x-1)=12/(1-9x的平方)
(1-3x)/(1+3x)-(3x+1)/(3x-1)=12/(1-9x的平方)
(1-3x)/(1+3x)+(3x+1)/(1-3x)=12/(1-9x的平方)
(1-3x)²+(3x+1)²=12
1-6x+9x²+9x²+6x+1=12
18x²=10
x²=5/9
x=±√5/3
[x(x+1)+x平方(x-1)]+(-3x)
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请问这道题咋做 :(x)X (x+1) X (x+2) X (x+3) =360
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