作业帮solve:log(x)+log(2x)=2
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solve:log(x)+log(2x)=2
solve:
log(x)+log(2x)=2
solve:log(x)+log(2x)=2
log2x2=2
2x2=100
x2=50
x=正负5倍根号2
x2指X的平方
如下：
log(x)+log(2x)=log[(x)(2x)]=log(2x的平方)=2
2x的平方=In2
x=根号（ln2/2）
solution：
lg(x)+lg(2x)=2
lg(2x^2)=2
2x^2=100
x^2=50
x=5根2或-5根2
x= 5 Sqrt[2]
由原式推出x+4=2^(2x)=4^x
你可以画一下Y=X+4和Y=4^X图像
或各自求一下导
logx+log(2x)=log(2x*x)=2;
x^2=(10^2)/2
x平方=50，x=5倍根号2
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