Răspunsuri

  • Utilizator Brainly
2014-07-23T17:28:10+03:00
A) Folosim formula unui binom diferenta: 49-14rad3+ 3= 52-14rad3............B) -5/4+2,5= -1,25+2,5=1,25
2014-07-23T19:35:27+03:00
(7-√3)²=7² - 2·7·√3+√3²=49-14√3+3=52-14√3

se simplifica 2 cu 8 si  vei transforma pe 2,5=25/10
5/4·(-1)+25/10=-5/4+5/2=(aduci la acelasi numitor cu 2 a doua fractie)=-5/4+10/4=5/4