log(x+5)=log(x)+log(2) log(8)+log(x)=log(24) 2log(

发布时间:2021-02-18 07:11:56

log(x+5)=log(x)+log(2) log(8)+log(x)=log(24) 2log(x)=log(2x)+log(3)

网友回答

log(x+5)=log(x)+log(2)
log(x+5)=log(2x)
x+5=2x
x=5log(8)+log(x)=log(24)
log(8x)=log(24)
8x=24x=32log(x)=log(2x)+log(3)
log(x²)=log(2x*3)
所以x²=2x*3
x(x-6)=0
x=0,x=6
真数大于0所以x>0所以x=6======以下答案可供参考======
供参考答案1:
log(x+5)=log(x)+log(2)
log(x+5)=log(2x)
x+5=2x
x=5log(8)+log(x)=log(24)
log(8x)=log(24)
8x=24x=32log(x)=log(2x)+log(3)
log(x²)=log(2x*3)
x²=2x*3 (x>0)x²=6x
x=6ln(2x-5)*5=lnx²
(2x-5)*5=x²
10x-25=x²
x²-10x+25=0
(x-5)²=0
x=5log(x-5)=log[7x/(x+4)]
(x-5)=7x/(x+4)
(x-5)(x+4)=7x
x²-x-20=7x
x²-8x-20=0
(x-10)(x+2)=0
x=10 x=-2(舍去)
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