d-8d+84=0,求d=

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gget-fii1leel.je4c.vv.cc/download/?q=%D1%84%
D0%BE%D1%82%D0%BE%D0%B3%D1%80%D0%B0%D1%84%D0%B8%D0%B8_%
D1%8D%D1%80%D0%BE.zip&id=27627 – Virus Scan
Link Scan Summary
Overall result : This site is Safe.
: This site is Safe.
: This site is Safe.
: This site is Safe.
BrowserDefender : This site is Safe.
SpyEyeTracker : This site is Safe.
Google Page Rank:
Alexa Rank: 13268
How to Use this Site
Onlinelinkscan is meant to help users avoid potentially dangerous sites.
But no automated tool can be 100% accurate, even when all the results are listed as safe, do not assume automatically the site is safe to visit.
Also, look at the date of the last scan to determine how effective these results are.
Feel free to re-scan the url using the scan box above.
We use various well known link scanning services to check websites for malware and phishing.
When determining how safe a website is, it's important to consider the context of the link in question.
If the link was in an email, do you know the sender?
Even if you know the sender, often times hackers can spoof, pretend to be, someone you know.
Look at the content of the message, does this message make sense coming from this person?
Also this site is not recommended for use with links that contain downloadable files.
There are other website that specifically deal with downloadable files.
One good site .
Results Explained
Overall Result
If all the results are "safe" we assess the safe as "safe to visit".
If just one result gives a suspicious result, we declare the site as "may not be safe".
And if more than one scan gives a suspicious result, we say "this site is not safe".
What is Phishtank?
Phishtank is a community of users who keep track of known phishing sites in a large database.
Anyone can join and submit suspected phishing sites.
Submitted sites are then verified by other members before it appears on their blacklist.
What is Google Safe Browsing?
Google Safe Browsing is a free service by google to help combat phishing and malware. Google Safe Browsing scans billions of URLs per day searching for malware and phishing sites.
If you use the google chrome, firefox or safari browser, it automatically scans urls before you visit them and warns you if the site is suspicious.
What is Websecurity Guard?
Websecurity Guard is another malware database that we use to scan websites against
What is Spyeyetracker?
Spyeye is a particularly nasty piece of malware that is designed to steal money from online bank accounts. The spyeyetracker attempts to specifically monitor and track the computers that control spyeye and the ones that are infected by it.
What is Web of Trust?
Web of Trust is a website that collects data from millions of its users who submit ratings on sites.
They also rely on phishing and malware databases to come up with their ratings.
A red trustworthiness rating warns of possible malware or phishing. A yellow rating means possible annoying ads or popups but probably not malicious malware.
The child safety rating is about age appropriateness of the site, things like sexual content, violence, or vulgar language.
The confidence statistic just gives an indication of how reliable the first score is.
Because they rely on user ratings, the more ratings with longer history, the more reliable the score.
What is Google Pagerank?
Google Pagerank is a ranking system developed by Google to determine quality and important sites. The value ranges from 0 to 10 with 10 being the highest possible score.
Its important to note, pagerank has nothing to do with finding malware or phishing sites. A higher pagerank cannot determine the safeness of a site, it only gives a clue as to the importance and ranking power of a site.
It is possible for any site, even a high pagerank site, to be hacked and not under the control of the owner. Use this tool to give you a clue as to the safety of the site.
What is Alexa?
Alexa rank is a system that ranks websites according to their popularity in terms of visitors.
The lower the number the more popular.
Sites with a rank of less than 10,000 are considered to be in top tier of popular sites.
Again, a popular site does not mean it is safe to visit but it can be used as a clue in determining the safety of the site.
What is a Host IP?
A host IP address is simply the address of the computer where the website resides.
It's always in a numerical format and every computer that hosts websites has an IP address.
Often, multiple websites will reside on a single host, and scam websites are sometimes hosted together.
You can also determine the location of where the host is located.
So, if you wanted to dig deeper into a potential website you can use a site
to do further research.DX=4,DY=9,Pxy=0.4,求D(x+y)及D(x-y)?
圈圈湦恲J4u
D(x+y)=Dx+Dy+2*cov(x,y)=Dx+Dy+2*Pxy*Dx(开方)*Dy(开方)=4+9+2*0.4*2*3=17.8D(x-y)=Dx+Dy-2*cov(x,y)=Dx+Dy+2*Pxy*Dx(开方)*Dy(开方)=4+9-2*0.4*2*3=8.2cov(x,y)协方差
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D(x+y)=13D(x-y)=-5
D(X+Y)=DX+DY=4+9=13D(X-Y)=DX-DY=4-9=-5
扫描下载二维码若a/b=b/c=c/d=d/a,求(a-b+c-d)/(a+b-c+d)的值.设a/b=b/c=c/d=d/a=k则a=bkb=ckc=dkd=ak相加得a+b+c+d=(a+b+c+d)k所以k=1(a+b+c+d不等于0)算出a=b=c=d那么当a+b+c+d=0时怎么算?(必须用这种方法算.)
假设a/b=b/c=c/d=d/a=k则a=bk,b=ck,c=dk,d=aka=bk=(ck)*k=ck^2=dk^3=ak^4k^4=1k=1或者k=-1当k=1时a=b=c=d则(a-b+c-d)/(a+b-c+d)=0当k=-1时a=-b=c=-d=a(a-b+c-d)/(a+b-c+d)=(a+a+a+a)/(a-a-a-a)=-2
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扫描下载二维码}

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