In(x-5)+In(x+3)-2In2=In(2x-9)

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/18 12:16:10
In(x-5)+In(x+3)-2In2=In(2x-9)
x)Ө5ƚFyF@QMR>v6~Oe,} dM@U Qg R~dR0Y4s<;mɋ+ "K!Ъ54625@ .PxdӾZDX=WrNWpC`y z;idg-

In(x-5)+In(x+3)-2In2=In(2x-9)
In(x-5)+In(x+3)-2In2=In(2x-9)

In(x-5)+In(x+3)-2In2=In(2x-9)
In(x-5)+In(x+3)-2In2=In((x-5)*(x-3)/4)=In(2x-9)
(x-5)*(x+3)/4=2x-9
所以
x=3或7

In(x-5)+In(x+3)-2In2=In(2x-9)
ln[(x-5)(x+3)/4]=ln(2x-9)
(x-5)(x+3)/4=2x-9
x*x-10x+21=0
x=3 或者 x=7
x=3 时 In(x-5) 失去意义
所以 x=7

In(x-5)+In(x+3)-2In2=In(2x-9)
ln[(x-5)(x+3)/4]=ln(2x-9)
(x-5)(x+3)/4=2x-9
x*x-10x+21=0
所以x=3或7
又x-5>0
所以x=7