已知2lg((x-y)除以2)=lgx+lgy,求x除以y的值
已知2lg((x-y)除以2)=lgx+lgy,求x除以y的值
其他人气:356 ℃时间:2020-01-29 07:43:05
优质解答
2lg((x-y)/2)=lg(((x-y)/2)^2)=lgx+lgy=lg(xy)lg(((x-y)/2)^2)=lg(xy)((x-y)/2)^2=xy((x-y)^2)/4=xyx2-2xy+y2=4xyx2-6xy+y2=0x=(-b+ -根号b方-4ac初以2a)=(3+ -(2根号2))yx/y=3+ -(2根号2)楼上的 括号里是x-...
我来回答
类似推荐
猜你喜欢
- 1some 的中文意思是什么?
- 2气字头下一个山字怎么读?
- 3雨的作文500字
- 4翻译In order that their son can go abroad to study,the parents sold their new-bought car
- 5Give me some magazines,please.___on the desk A:The one B:The ones
- 6you never know how far you can go unless you
- 71到30的自然数中,2的倍数有( )个,3的倍数有( )个,5的倍数有( )个.其中同时是
- 8氧化还原反应方程式如何配平?
- 9如图,在平行四边形ABCD中,AB=6,AD=9,∠BAD的平分线交BC于点E,交DC的延长线于点F,BG⊥AE,垂足为G,BG=42,则△CEF的周长为_.
- 10新4第4课:Such is human nature,that a great many people are willing to sacrifice higher pay for the