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(2)
x/(x+1) = 2/(3x+3) +1 (x≠-1)
x/(x+1) = (2+3x+3)/(3x+3)
x= (3x+5)/3
3x=3x+5
x : 无解
(3)
5/(x^2+x) -1/(x^2-x) =0 (x≠0,-1,1)
[5(x-1) -(x+1)]/[x(x+1)(x-1)]=0
5(x-1) -(x+1) =0
4x-6=0
x=3/2
x/(x+1) = 2/(3x+3) +1 (x≠-1)
x/(x+1) = (2+3x+3)/(3x+3)
x= (3x+5)/3
3x=3x+5
x : 无解
(3)
5/(x^2+x) -1/(x^2-x) =0 (x≠0,-1,1)
[5(x-1) -(x+1)]/[x(x+1)(x-1)]=0
5(x-1) -(x+1) =0
4x-6=0
x=3/2
更多追问追答
追问
第二题是两边同时乘以多少?
(x+1)(3x+3)?
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