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2亿+学生的选择
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2亿+学生的选择
如图，每一个英文字母代表0，1，2…9中的一个数字，不同的字母代表不同的数字，则字母A、Q、T、R、F分别代表什么数字？
易桀是傻瓜46
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2亿+学生的选择
根据以上分析，A=2，Q=5，T=1，F=3，R=7，如图，
为您推荐：
由Q×Q，乘积个位不变，知5×5=25或6×6=36；由A×Q+进位2或3，乘积个位为A，可知，Q=5，A=2；由T×AQ=AQ，得T=1，所以是25×15=375，据此得解．
本题考点：
竖式数字谜．
考点点评：
本题考查学生的乘法的计算熟练程度，能激起学生学习的兴趣，是个好题．
扫描下载二维码From Wikipedia, the free encyclopedia
Content negotiation refers to mechanisms defined as a part of
that make it possible to serve different versions of a document (or more generally, representations of a resource) at the same , so that
can specify which version fits their capabilities the best. One classical use of this mechanism is to serve an image in
format, so that a browser that cannot display PNG images (e.g. MS Internet Explorer 4) will be served the GIF version.
A resource may be available in several diffe for example, it might be available in different languages or different media types. One way of selecting the most appropriate choice is to give the user an index page and let them select the mos however it is often possible to automate the choice based on some selection criteria.
HTTP provides for several different content negotiation mechanisms including: server-driven (or proactive), agent-driven (or reactive), transparent, and/or hybrid combinations thereof.
Server-driven or proactive content negotiation is performed by algorithms on the server which choose among the possible variant representations. This is commonly performed based on an user-agent provided acceptance criteria.
To summarize how this works, when a user agent submits a request to a server, the user agent informs the server what
it understands with ratings of how well it understands them. More precisely, the user agent provides an Accept
that lists acceptable media types and associated quality factors. The server is then able to supply the version of the resource that best fits the user agent's needs.
This works because browsers can send information as part of each request about the representations they prefer. For example, a browser could indicate that it would like to see information in German, if possible, else English will do. Browsers indicate their preferences by headers in the request. To request only German representations, the browser would send:
Accept-Language: de
Note that this preference will only be applied when there is a choice of representations and they vary by language.
As an example of a more complex request, this browser has been configured to accept German and English, but prefer German, and to accept various media types, preferring HTML over plain text or other text types, and preferring GIF or
over other media types, but also allowing any other media type as a last resort:
Accept-Language: q=1.0, q=0.5
Accept: text/ q=1.0, text/*; q=0.8, image/ q=0.6, image/ q=0.6, image/*; q=0.5, */*; q=0.1
In addition to server-driven content negotiation by
and by , there is an extension to use content negotiation to retrieve prior version in time with the Accept-Datetime header.
does not specify how to resolve trade-offs (such as, in the above example, choosing between an HTML page in English and a GIF image in German).
Agent-driven or reactive content negotiation is performed by algorithms in the user-agent which choose among the possible variant representations. This is commonly performed based on a server provided list of representations and metadata about them.
To summarize how this works, when a user agent submits a request to a server, the server informs the user-agent which representations it has available as well as any metadata it has about each representation (e.g., content-type, quality, language, etc.). The user-agent then resubmits the request to a specific URL for the chosen representation. This can be automatically chosen by the user-agent or the user-agent can present the user with the choices and the user can directly choose such. More precisely, the server responds with either 300 Multiple Choices or 406 Not Acceptable (when server-driven, user-agent provided acceptance criteria is provided but the server cannot automatically make a selection). Unfortunately HTTP leaves the format of the list of representations and metadata along with selection mechanisms unspecified.
User-agents can request data in specified formats from web services or web APIs, such as application/json or application/xml.
. Mementoweb.org. Retrieved on .
— Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content – ()
— Transparent Content Negotiation in HTTP
— HTTP Remote Variant Selection Algorithm -- RVSA/1.0
This article is based in part on , which is copyrighted by the Apache Foundation but released under a free license.
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