Question

 Imi rezolva si mie cineva asta ?? Vaa rogg :o3 (1+2+3+..+x):x=55

Answer 1

$(1+2+3+..+x):x=55 \\ 1+2+3+..+x=55x \\ \frac{x(x+1)}{2} =55x \\ x(x+1)=110x \\ x+1= \frac{110x}{x} \\ x+1=110 \\ x=109$