Question

cum se rezolva exrcitiile de genul asta 2+3+4+........+30???​ Va rog am nevoie de ajutor foarte repede

Answer 1

 

$\\\displaystyle\bf\\Pasul~1:~~ Calculam~numarul~ de~ termeni~ n.\\n=30-2+1=28+1=29~de~de~termeni.n=29\\\\Pasul~2\\Aplicam~formula~lui~ Gauss:\\\\Suma=2+3+4+...+30=\frac{n(30+2)}{2}=\frac{29\times32}{2}=29\times16=\boxed{\bf464}$