log(x+5)=log(x)+log(2) log(8)+log(x)=log(24) 2log(
答案:2 悬赏:30 手机版
解决时间 2021-01-27 03:54
- 提问者网友:蓝莓格格巫
- 2021-01-26 08:21
log(x+5)=log(x)+log(2) log(8)+log(x)=log(24) 2log(
最佳答案
- 五星知识达人网友:狂恋
- 2021-01-26 08:35
log(x+5)=log(x)+log(2)log(x+5)=log(2x)x+5=2xx=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*3x(x-6)=0x=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=2xx=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=6xx=6ln(2x-5)*5=lnx²(2x-5)*5=x²10x-25=x²x²-10x+25=0(x-5)²=0x=5log(x-5)=log[7x/(x+4)](x-5)=7x/(x+4)(x-5)(x+4)=7xx²-x-20=7xx²-8x-20=0(x-10)(x+2)=0x=10 x=-2(舍去)
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- 1楼网友:底特律间谍
- 2021-01-26 10:13
好好学习下
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