Question

cum se rezolva :3+6+9+...+297=150x cum il aflu pe x?

Answer 1

3+6+9+...+297=150x
3(1+2+3+...99)=150x
3*99*100:2=150x
14850=150x
x=14850:150
x=99

Answer 2

[tex]150x=3+6+9+.....+297 \\ \\ 150x=3(1+2+3+.....+99)|:3 \\ \\ 50x=1+2+3+......+99 \\ \\ 50x= \frac{99(99+1)}{2} \\ \\ 50x= \frac{100*99}{2} \\ \\ 50x=50*99|:50 \\ \\ \boxed{x=99}[/tex]