The number of backlinks in the site why the difference is so great

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Use the Search Engine Reverse link tool to inquire about the reverse link of my website on Google,baidu,yahoo. I was amazed at the result.

Site on Google reverse link situation query:

Reverse Link Number: Reverse link on Google query:

Reverse Link Number: 1

Website in Baidu reverse link inquiry:

Reverse link number: On Baidu Reverse link situation query:

Reverse Link Number: 1

Site on Yahoo on the reverse link situation query:

Reverse Link Number: Reverse link on yahoo query:

Reverse Link Number: 40

I 211.html "> think Yahoo's reverse link number is more accurate, so specifically to Yahoo site to look at the reverse link." The method is to enter Linkdomain:www.zmvincin.com,yahoo on the www.yahoo.com.cn to list all the external links in detail. There is information that Google's external links are the most inaccurate, so I opened Google Webmaster tools, view the number of links to the site, the total is 69, and the first page of the external link is 26. and is the number of external links to each page are listed in detail, so that the www.google.com on the input link: Domain Name query site external links, has been too inaccurate. And Google Webmaster Tools can also be the site's internal links listed, my site's internal link number is 43. Also, there is a feeling that if the number of external links increased a lot, and you exchange the quality of external links, whether it can be foreseen that the next time Google PR value update, there will be a higher value? This is to be verified, if so, then this will be more effective than the PR value prediction tool.

Then there is the remaining one Baidu's reverse link value, because the official Baidu did not provide additional tools, so there is no way to know the exact value. Please inform me of your knowledge.