HTML - Wikipedia, the free encyclopedia

HTML - Wikipedia, the free encyclopedia: "HTML, which stands for HyperText Markup Language, is the predominant markup language for web pages. A markup language is a set of markup tags, and HTML uses markup tags to describe web pages.

HTML is written in the form of HTML elements consisting of 'tags' surrounded by angle brackets (like ) within the web page content. HTML tags normally come in pairs like and . The first tag in a pair is the start tag, the second tag is the end tag (they are also called opening tags and closing tags).

The purpose of a web browser is to read HTML documents and display them as web pages. The browser does not display the HTML tags, but uses the tags to interpret the content of the page.

HTML is the building blocks of all basic websites. It allows images and objects to be embedded and can be used to create interactive forms. It provides a means to create structured documents by denoting structural semantics for text such as headings, paragraphs, lists, links, quotes and other items. It can embed scripts in languages such as JavaScript which affect the behavior of HTML webpages.

HTML can also be used to include Cascading Style Sheets (CSS) to define the appearance and layout of text and other material. The W3C, maintainer of both HTML and CSS standards, encourages the use of CSS over explicit presentational markup

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HTML pe intelesul tuturor - curs online

HTML pe intelesul tuturor - curs online: "HTML pe intelesul tuturor
Cu ajutorul limbajului HTML (Hyper Text Markup Language) poti construi pagini web nu foarte pretentioase insa reprezinta un inceput pentru realizarea site-urilor profesionale. Sigur ca va trebui sa mai treaca ceva timp pana vei putea realiza pagini web complexe ca cele ale marilor firme, insa asa cum spuneam, invatarea limbajului HTML reprezinta un inceput.

Exista multe programe cu ajutorul carora scrierea codului HTML nu mai este necesara, aceste programe scriindu-l in locul tau. Insa aceste programe nu fac subiectul acestui curs, iar pentru a putea construi o pagina web este nevoie cel putin de niste cunostinte elementare de HTML pe care am incercat sa le explicam in cadrul cursului. Cursul de fata se adreseaza, in primul rand, celor care vor sa invete limbajul HTML, si astfel, prin scrierea codului, sa detina controlul absolut asupra viitoarei pagini web.
Curs online: HTML pe intelesul tuturor
Scopul cursului 'HTML pe intelesul tuturor' este de a explica, intr-un mod cat mai util si in acelasi timp placut, notiunile de baza ale limbajului HTML si odata cu acestea sa initieze viitorii cursanti in tehnica realizarii unei pagini web. Pe parcursul acestui curs, vei gasi foarte multe exemple, iar in ultima lectie, folosind notiunile invatate, vom realiza impreuna site-ul unei gradinite particulare.
Lectiile cursului sunt:


Lectia 1: Introducere
Lectia 2: Structura unui document HTML
Lectia 3: Despre atribute
Lectia 4: Despre culori
Lectia 5: Formatarea textului
Lectia 6: Imagini
Lectia 7: Legaturi
Lectia 8: Liste
Lectia 9: Tabele
Lectia 10: Cadre
Lectia 11: Formulare
Lectia 12: Realizarea unui site

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HTML Tutorial: "W3Schools.com
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96 Microsoft Excel

Prezentam mai jos unele din principalele functi matematice din Excel însotite de un exemplu de utilizare. Lista tuturor functilor care se gasesc la categoria Math&Trig se afla în Anexa 1 – Excel.

Functia Exemplu de utilizare Rezultat

abs(x) =ABS(-1.5) 1.5 acos(x) =ACOS(1/2) 1.047198 asin(x) =ASIN(1/2) 0.523599 atan(x) =ATAN(1) 0.785398 combin(n;k) =COMBIN(5;2) 10 cos(x) =COS(30*PI()/180) 0.866025 cosh(x) =COSH(0) 1 degrees(radians) =DEGREES(PI()/180) 1 exp(x) =EXP(1) 2.718282 fact(n) =FACT(4) 24 ln(x) =LN(EXP(1) 1 log10(x) =LOG10(1000) 3 log(x;b) =LOG(9;3) 2 pi() =PI() 3.141593 power(x;p) =POWER(2;5) 32 product(x1,x2,.) =PRODUCT(5;6;10) 300 radians(angle) =RADIANS(180) 3.141593 sign(x) =SIGN(-7) -1 sin(x) =SIN(30*PI()/180) 0.5 sqrt(x) =SQRT(25) 2 tan(x) =TAN(45*PI()/180) 1

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Microsoft Excel 95

• În fereastra SIN, la rubrica Number, se va scrie valoarea în radiani a unghiului al carui sinus îl calculam. Pentru a transforma gradele sexagesimale în radiani se înmulteste valoarea în grade cu PI()/180. În cazul nostru, pentru a calcula sinus de 15 grade trebuie sa scriem 15*PI()/180.

• Se apasa OK. În celula selectata se obtine valoarea 0.258819045.

Erori În cazul în care Excel nu poate evalua o formula afiseaza un mesaj de eroare. Aceste mesaje sunt: #DIV/0! - împartire la zero; #N/A - valoare lipsa; #NAME? - nume invalid; #NULL! - intersectie vida între doua domeni; #NUM! - numar invalid; #REF! - referinta invalida; #VALUE! - valoare incorecta ####### - indicator de afisare imposibila.

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94 Microsoft Excel

Functiile interne ale programului Excel

Ce sunt functile? Functile Excel sunt formule predefinite, care efectueaza o serie de operatiuni pe un anumit domeniu de valori. Ele primesc la intrare anumite valori, numite argumente, efectueaza prelucrarea acestora si întorc în program una sau mai multe valori. De exemplu, pentru a calcula suma celulelor de la A5 la G5 se scrie: =SUM(A5:G5).

Excel contine numeroase functi, care sunt grupate pe categori dupa domeniul lor de aplicabilitate. Ele se pot vedea executând comanda Function… din meniul Insert.

Introducerea unei functi Pentru a întelege mai bine cum se introduce o functie consideram urmatorul exemplu.

Exemplu: Calculul valori sinusului de 15 grade. • Se selecteaza celula în care se doreste aparitia rezultatului. • Se deschide meniul Insert si se da comanda Function. . • În fereastra de dialog care apare, Paste Function, la rubrica Function Category, se selecteaza Math&Trig, iar la rubrica Function Name se selecteaza SIN si se da OK.

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Microsoft Excel 93

Pentru a introduce o formula prin tastarea operatorilor matematici si selectând cu mouse-ul referintele celulei se parcurg pasi: • Se selecteaza celula unde se doreste aparitia rezultatului. • Se tasteaza semnul egal. • Se da clic pe celula a carui adresa trebuie sa apara în formula. Adresa acesteia apare în bara de formule. • Se tasteaza operatorul matematic. Acesta va apare în bara de formule. • Se continua selectia celulei care trebuie sa apara în formula si scrierea operatorului matematic pâna la scrierea completa a formulei dorite. • La terminare se apasa tasta Enter pentru introducerea formulei (Operatia se poate anula tastând Escape).

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