Question

aflati x stiind ca: 1+3+5+7+...x= 1024

Answer 1

Răspuns:

x=63

Explicație pas cu pas:

S=1+3+5+.......+x

S=x+.........+3+1

2S=x+1+x+1+......+x+1

2S=(x+1)×(x+1)/2

S=((x+1)/2)²

x+1=64

x=63