Question

4+8+12+...+396=200x aflati nr x

Answer 1

4+8+12+...+396=200x
4(1+2+3+...+99)=200x
4(99*100):2=200x (se simplifica 4 cu 2 si ramane 2 sus)
2(99*100)=200x
2*9900=200x
19800=200x
$x=\frac{19800}{200}$
x=99

Sper ca te-am ajutat.